sajangnimi hoeui junge gyeyak jogeoneul gilge seolmyeonghasyeosseoyo.

님 is an honorific title suffix. It adds respect.

• 사장 = company president / boss / CEO
• 사장님 = respected boss / president

In Korean, it is very common to attach 님 when referring politely to someone in a higher position. Since this sentence also uses an honorific verb form, 사장님 fits the respectful tone very naturally.

이/가 is the subject marker. Here, 사장님이 means the boss is the person doing the action of explaining.

So the sentence structure is roughly:

• 사장님이 = the boss (subject)
• 설명하셨어요 = explained

A learner may wonder why it is not 사장님은. Both can be possible in different contexts, but they have different nuances:

• 사장님이: identifies the boss as the subject; often more neutral or focused
• 사장님은: adds contrast or topic emphasis, like as for the boss...

In this sentence, 이 is a straightforward subject marker.

중 means in the middle of or during.
So 회의 중에 means during the meeting or in the middle of the meeting.

Breakdown:

• 회의 = meeting
• 중 = middle / during
• 에 = at / in / during that time

So 회의 중에 tells you when the explanation happened.

Both can be translated as during the meeting, but the nuance is a little different.

• 회의 중에 = in the course of the meeting / at some point while the meeting was going on
• 회의 동안 = for the duration of the meeting / throughout the meeting period

In many everyday contexts, they overlap. But 중에 often sounds like something happened at some point within that ongoing event, while 동안 emphasizes the time span itself.

So here, 회의 중에 feels very natural for during the meeting, the boss explained...

계약 조건 means contract terms/conditions.

• 계약 = contract
• 조건 = condition, term
• 을 = object marker

The verb 설명하다 takes an object: you explain something.
That something here is 계약 조건.

So:

• 계약 조건을 설명하다 = to explain the contract terms

Korean often does not mark plural unless it is necessary.

So 계약 조건 can mean:

• a contract condition
• contract conditions
• contract terms

In real usage, this phrase often naturally means the terms/conditions of the contract without needing a separate plural marker.

Korean relies a lot on context, so English learners should not expect plural marking every time.

Because 길게 is the adverb form of 길다.

• 길다 = to be long
• 길게 = long / at length, used to modify a verb

Here it modifies 설명하셨어요:

• 길게 설명하셨어요 = explained at length / explained for a long time

Compare:

• 긴 설명 = a long explanation (긴 modifies a noun)
• 설명이 길어요 = the explanation is long
• 길게 설명했어요 = explained at length (길게 modifies a verb)

More or less, yes. Literally it comes from longly explain, but natural English would be:

• explain at length
• give a lengthy explanation
• explain for a long time

This is a very common Korean way to describe how an action is done: adjective stem + -게 to make an adverb.

Examples:

• 빠르게 말하다 = speak quickly
• 조용히 말하다 = speak quietly
• 길게 설명하다 = explain at length

설명하셨어요 is the polite past honorific form of 설명하다.

Break it down:

• 설명하다 = to explain
• 설명하시다 = honorific form, used when the subject deserves respect
• 설명하셨어요 = explained / did explain, polite past honorific

More detailed breakdown:

• 설명하- = explain
• -시- = honorific marker
• -었- = past tense
• -어요 = polite ending

So this verb shows both:

1. past tense
2. respect toward the subject, 사장님

Because the subject is 사장님, someone of higher status who is being spoken of respectfully.

In Korean, if the person doing the action deserves respect, the verb often uses -시-.

Compare:

• 사장님이 설명했어요 = grammatically possible, but less respectful
• 사장님이 설명하셨어요 = respectful and natural

Using -시- matches the respectful noun 사장님 and makes the whole sentence sound socially appropriate.

This comes from the verb 하다 combined with the honorific marker -시-.

The form develops like this:

• 하다
• 하시다 (honorific)
• 하셨다 / 하셨어요 (past honorific)

So 하셨어요 is the correct form.
해셨어요 is not correct standard Korean for this pattern.

This is a common thing to memorize:

• 하다 → 해요
• 하시다 → 하세요
• 하셨다 → 하셨어요

The sentence follows the usual Korean pattern of putting the verb at the end.

A rough breakdown is:

• 사장님이 = subject
• 회의 중에 = time expression
• 계약 조건을 = object
• 길게 = adverb
• 설명하셨어요 = verb

So the order is basically:

Subject + Time + Object + Adverb + Verb

English speakers often want to say the verb earlier, but in Korean the main verb usually comes last.

Yes. Korean word order is flexible as long as the particles and meaning stay clear.

For example, these are also possible:

• 회의 중에 사장님이 계약 조건을 길게 설명하셨어요.
• 사장님이 계약 조건을 회의 중에 길게 설명하셨어요.

They all mean roughly the same thing, though the emphasis may shift slightly.

Still, the original order sounds very natural: 사장님이 회의 중에 계약 조건을 길게 설명하셨어요.

Yes.

• 말하다 = to speak / say / talk
• 설명하다 = to explain

설명하다 specifically means giving an explanation, clarifying details, or laying something out in an understandable way.

So if someone is talking through contract terms in detail, 설명하다 is much more precise than 말하다.

Yes. It sounds polite and fairly formal, mainly because of:

• 사장님 = respectful title
• 계약 조건 = business/legal vocabulary
• 설명하셨어요 = polite honorific verb form

This is the kind of sentence that fits a workplace or business context very well. It does not sound stiff or unnatural, but it is definitely not casual everyday slang.