Если Вы с коллегой слушаете друг друга внимательно, Вам легче договориться.

Capitalized Вы is a polite written convention in Russian when addressing one person respectfully, similar to writing a very formal you.

So here Вы means formal singular you, not necessarily plural you all.

That said, in this sentence the phrase Вы с коллегой means you and your colleague, so the overall meaning involves two people.

Вы с коллегой literally means you with a colleague, but in natural English it corresponds to you and your colleague.

Russian often uses this pattern:

• я с братом = my brother and I
• ты с подругой = you and your friend
• Вы с коллегой = you and your colleague

It is a very natural way to express a joint subject.

Because the preposition с in the meaning with requires the instrumental case.

So:

• коллега = nominative
• с коллегой = instrumental, with a colleague

This is a very common pattern in Russian:

• с другом = with a friend
• с сестрой = with a sister
• с коллегой = with a colleague

друг друга is the standard Russian way to say each other.

So:

• слушать друг друга = to listen to each other

Russian does not usually use a single word equivalent to English each other. Instead, it uses this fixed reciprocal expression.

Examples:

• они любят друг друга = they love each other
• мы понимаем друг друга = we understand each other
• Вы с коллегой слушаете друг друга = you and your colleague listen to each other

слушаете is the 2nd person plural form of слушать.

That same form is also used for formal singular Вы.

So on its own, Вы слушаете could mean either:

• you listen (formal singular)
• you all listen (plural)

In this sentence, because of Вы с коллегой and друг друга, the meaning is clearly about two participants: you and your colleague listen to each other.

Because Если Вы с коллегой слушаете друг друга внимательно is a subordinate clause introduced by Если (if).

In Russian, a subordinate clause is normally separated from the main clause by a comma:

• Если ..., ...

So the structure is:

• Если Вы с коллегой слушаете друг друга внимательно,
• Вам легче договориться.

This is standard Russian punctuation.

Russian often uses the dative case to express the person who experiences a state or feeling.

So:

• Вам легче literally means to you, it is easier
• more naturally: it is easier for you

This pattern is very common:

• мне трудно = it is hard for me
• ему холодно = he is cold / it is cold for him
• нам удобно = it is convenient for us
• Вам легче = it is easier for you

So Вам is in the dative case because it marks the experiencer.

легче is the comparative form of легко (easily / easy in predicative use).

Here it means easier.

So:

• легко договориться = it is easy to reach an agreement
• легче договориться = it is easier to reach an agreement

Russian often uses these short predicative words where English uses expressions like it is easy, it is hard, it is possible, etc.

Because after words like легко, трудно, можно, нельзя, легче, Russian very often uses an infinitive to describe the action.

So:

• Вам легче договориться = It is easier for you to come to an agreement

This is a very normal pattern:

• мне трудно понять = it is hard for me to understand
• нам легко работать вместе = it is easy for us to work together
• Вам легче договориться = it is easier for you to reach an agreement

This is about aspect.

• договариваться = imperfective, focusing on the process or repeated action of negotiating/coming to agreements
• договориться = perfective, focusing on the result: to reach an agreement

In this sentence, the idea is that careful listening helps produce a successful result, so the perfective договориться is the natural choice.

In other words:

• легче договориться = easier to actually reach agreement

Here слушать means to listen (to), not just to hear.

That is an important difference in Russian:

• слышать = to hear
• слушать = to listen

So слушаете друг друга внимательно means listen to each other attentively/carefully, not just hear each other.

внимательно modifies слушаете, so it means attentively / carefully.

The placement here is natural:

• слушаете друг друга внимательно

But Russian word order is flexible, so you could also see:

• внимательно слушаете друг друга
• слушаете внимательно друг друга (less neutral, more marked)

The given version is perfectly normal and sounds natural.

No extra word is required. Russian often leaves out elements that English needs.

Literally, the structure is something like:

• To you easier to reach an agreement

But in natural English we say:

• It is easier for you to reach an agreement

Russian does not need an explicit it here, and in the present tense it also often omits is.

So Вам легче договориться is already complete and grammatical.

In this sentence, Если means if.

Russian если introduces a condition:

• Если будете слушать, будет легче договориться = If you listen, it will be easier to reach agreement.

If Russian wants to say when in a time sense, it usually uses когда, not если.

So here the meaning is conditional, not temporal.