kaigi de atarasii iken wo dasimasita.

You’re right: normal Japanese writing usually does not use spaces between words.

This sentence would normally be written as:

会議で新しい意見を出しました。

Spaces are often added in beginner materials to make the sentence structure easier to see.

A natural reading is:

かいぎ で あたらしい いけん を だしました。

Word by word:

• 会議 → かいぎ = meeting, conference
• で = at, in, at the setting of
• 新しい → あたらしい = new
• 意見 → いけん = opinion, idea
• を = marks the direct object
• 出しました → だしました = put out, gave, presented, proposed

Here, で marks the place or setting where an action happens.

So 会議で means:

• at the meeting
• in the meeting

It tells you where the action of 出しました happened.

This is a very common question.

• で is used for the location where an action takes place
• に is often used for a destination, a specific time, or existence

In this sentence, the speaker did an action—they presented or offered an opinion—at the meeting, so で is the natural choice.

Compare:

• 会議で話しました。 = I spoke at the meeting.
• 会議に行きました。 = I went to the meeting.

Yes, 意見を出す is a very common expression.

Literally, 出す means to put out or to bring out, but in many expressions it has a broader meaning.
So 意見を出す means things like:

• to give an opinion
• to offer an opinion
• to present an idea
• to speak up with a suggestion

So even though the literal image is putting out an opinion, the natural English meaning is more like offering or presenting one.

を marks the direct object of the verb.

Here, the thing being put forward / presented is 意見.

So:

• 意見を出しました = (someone) presented an opinion

A simple way to think about it:

• the verb is 出しました
• what was presented? → 意見
• therefore 意見 takes を

In Japanese, adjectives come before the noun they describe.

So:

• 新しい意見 = a new opinion / new ideas

This works a lot like English in this case:

• new opinion
• interesting book
• small room

Because 新しい is an い-adjective, it directly modifies the noun with no extra word needed.

Because Japanese is usually a verb-final language.

A very common basic sentence order is:

• topic / subject
• time
• place
• object
• verb

So in this sentence:

• 会議で = at the meeting
• 新しい意見を = a new opinion
• 出しました = presented / gave

The verb normally comes last, which is one of the biggest differences from English.

出しました is past tense and polite.

It comes from the dictionary form:

• 出す = to put out / present / offer

Then:

• 出します = polite non-past
• 出しました = polite past

So 出しました means:

• gave
• presented
• offered

depending on context.

In many cases, the Japanese past tense does more than just mark past time. It can also suggest that the action was completed.

So 意見を出しました means not just was giving an opinion, but more like:

• gave an opinion
• put forward an opinion
• did present an opinion

It sounds like the action was actually carried out.

The subject is omitted, which is extremely common in Japanese.

Japanese often leaves out information that is understood from context, especially:

• I
• you
• he/she
• topics already mentioned

So this sentence could mean:

• I presented a new opinion at the meeting.
• She presented a new opinion at the meeting.
• They brought up a new idea at the meeting.

The exact subject depends on the situation.

Japanese nouns usually do not change form for singular and plural.

So 意見 can mean:

• an opinion
• opinions

In this sentence, because of the overall phrasing, learners often translate it as a new opinion or a new idea, but depending on context it might also refer more generally to new ideas.

Japanese often leaves number unspecified unless it really matters.

It is polite but neutral because of 出しました.

The -ました ending is the standard polite style used in:

• everyday respectful conversation
• work situations
• speaking to teachers, coworkers, customers, etc.

Compare:

• 意見を出しました。 = polite
• 意見を出した。 = plain / casual

Because the sentence is about a meeting, the polite form sounds especially natural.

Yes, Japanese word order is fairly flexible as long as the particles stay correct.

For example, these can all be possible depending on emphasis:

• 会議で新しい意見を出しました。
• 新しい意見を会議で出しました。

Both are understandable because:

• で still marks the setting
• を still marks the object

However, the most neutral and natural order for beginners is often the original one: 会議で新しい意見を出しました。

Not literally.

This is one of those cases where a very common Japanese verb has a broader range of meanings than a single English verb.

出す can mean things like:

• take out
• send
• submit
• serve
• publish
• present
• offer

So in 意見を出す, it does not mean physically pulling an opinion out of somewhere. It means bringing an idea forward in a discussion.

Yes. The pattern is very reusable:

[place/setting] で [noun] を 出しました

Examples:

• 会議で質問を出しました。 = I raised a question at the meeting.
• 授業で意見を出しました。 = I gave an opinion in class.
• 案を出しました。 = I proposed a plan/idea.

So this sentence is useful as a model for talking about presenting something in a specific setting.