jamageul bomyeonseo yeonghwareul bomyeon ihaehagi swiwoyo.

They are both from the verb 보다 (to see / to watch / to look at), but they do different jobs here:

• 자막을 보면서 = while looking at/reading subtitles
• 영화를 보면 = if/when you watch a movie

So the same verb appears twice, but with different grammar attached to it:

• -면서 = while doing
• -(으)면 = if/when

This is very normal in Korean, even if it feels repetitive in English.

-면서 means while doing or at the same time as doing.

So:

• 자막을 보면서 = while looking at subtitles
• literally: looking at subtitles while...

It connects two actions happening together. In this sentence, the person is:

1. looking at subtitles, and
2. watching the movie

at the same time.

보면 is the -(으)면 form of 보다, which usually means if or when.

So:

• 영화를 보면 = if/when you watch a movie

In this sentence, it gives the condition under which something is easy:

• If/when you watch a movie while reading subtitles, understanding is easy.

In everyday English, we would usually translate the whole sentence more naturally rather than word-for-word.

Because 자막 (subtitles) is the object of the first 보다.

• 자막을 보다 = to look at / read subtitles

The object marker 을/를 marks what you are looking at, watching, reading, etc.

Here:

• 자막
  • 을 → 자막을

So the sentence is structurally:

• subtitles + object marker + while looking
• movie + object marker + if watching
• understanding + easy

Because 영화 is also the object of 보다.

• 영화를 보다 = to watch a movie

The verb 보다 takes an object, so 영화 gets 을/를, not 이/가.

Compare:

• 영화를 봐요 = I watch a movie
• 영화가 좋아요 = The movie is good / I like the movie

In your sentence, 영화 is the thing being watched, so 영화를 is correct.

This is a very common Korean pattern:

• verb stem + -기 쉽다 = easy to do
• verb stem + -기 어렵다 = difficult to do

So:

• 이해하다 = to understand
• 이해하기 = understanding / to understand
• 이해하기 쉬워요 = it is easy to understand

Literally, 쉬워요 means is easy, and 이해하기 turns the verb understand into something like understanding or to understand.

So the whole ending means:

• is easy to understand

Because -기 can turn a verb into a noun-like form.

Here:

• 이해하다 = to understand
• 이해하기 = understanding / understanding it / to understand

This lets Korean say things like:

• 읽기 쉬워요 = easy to read
• 쓰기 어려워요 = difficult to write
• 배우기 재미있어요 = fun to learn

So 이해하기 쉬워요 is literally something like understanding is easy or it is easy to understand.

Yes, Korean often leaves out subjects or topics when they are obvious from context.

A fuller version could be something like:

• 영화를 이해하기 쉬워요 = It is easy to understand the movie
• or 내용을 이해하기 쉬워요 = It is easy to understand the content

But Korean often drops things that listeners can easily infer. In this sentence, what is easy to understand is clearly the movie or its content, so it does not need to be stated explicitly.

Yes, the subject is not stated, and that is very common in Korean.

English usually wants a subject like:

• you
• it
• people

But Korean often leaves that out if it is understood from context.

So depending on context, this sentence could mean:

• It’s easy to understand when you watch movies while reading subtitles.
• If you watch a movie with subtitles, it’s easier to understand.
• Watching a movie while reading subtitles makes it easier to understand.

Korean does this kind of omission all the time.

Korean often puts background information first and the main point later.

So this sentence goes in this order:

1. 자막을 보면서 = while looking at subtitles
2. 영화를 보면 = if/when you watch a movie
3. 이해하기 쉬워요 = it is easy to understand

This may feel backward compared with English, but it is normal in Korean for conditions, time phrases, and background actions to come before the main statement.

Not exactly, but in practice the meaning is very close.

• 자막을 보면서 literally means while looking at/reading subtitles
• English often says with subtitles

So the Korean expression focuses more on the action of actually reading or looking at the subtitles, not just their existence.

That is why the sentence can sound a little more active than a simple English phrase like with subtitles.

Yes. 보며 is a shorter form of 보면서.

So these are both possible:

• 자막을 보면서 영화를 보면 이해하기 쉬워요.
• 자막을 보며 영화를 보면 이해하기 쉬워요.

The meaning is basically the same.
보면서 often sounds a little more conversational and explicit, while 보며 can sound slightly more written or concise.

Yes, it is natural and understandable.

A very natural idea here is:

• If you watch a movie while reading subtitles, it’s easy to understand.

You could also hear similar versions such as:

• 자막을 보면서 영화를 보면 더 이해하기 쉬워요.
  = It’s easier to understand if you watch a movie while reading subtitles.

• 자막과 같이 보면 이해하기 쉬워요.
  = It’s easy to understand if you watch it together with subtitles.

Your original sentence is perfectly fine, and it is especially useful for learning the grammar patterns -면서, -(으)면, and -기 쉽다.