المدربة بعدها واقفة جنب حارة السباحة.

In this sentence, بعدها means she is still or she’s still.

In Levantine, بعد + pronoun is a very common way to say still:

• بعده = he is still
• بعدها = she is still
• بعدهم = they are still

So:

• المدربة بعدها واقفة = The coach is still standing

Even though بعدها can literally mean after her in other contexts, here the meaning is clearly still, because it is followed by a description of her state: واقفة.

Because in Arabic, especially in the present tense, you usually do not say a separate word for am / is / are.

So English:

• The coach is standing

becomes Arabic:

• المدربة واقفة

And if you want to say is still standing, you can say:

• المدربة بعدها واقفة

This is very normal in Levantine.

Because the subject is feminine.

• المدربة = the female coach / trainer
• واقفة = standing in the feminine form

Arabic usually shows gender agreement, so if the subject is feminine, the describing word also becomes feminine.

Compare:

• المدربة بعدها واقفة = the female coach is still standing
• المدرب بعده واقف = the male coach is still standing

So the ـة in المدربة and واقفة is part of that feminine pattern.

It is an active participle, which is a form that often works like an adjective but can express a current state.

Here, واقفة means standing or in a standing position.

So in Levantine, active participles are often used where English uses be + -ing:

• قاعد = sitting
• واقف / واقفة = standing
• نايم = sleeping / asleep
• ماشي = walking / going

So المدربة بعدها واقفة literally feels like the coach, still standing, but naturally it means the coach is still standing.

That is a very normal Levantine pattern.

The structure is:

• subject + بعد + pronoun + description/state

So:

• المدربة بعدها واقفة
• الولد بعده نايم
• البنات بعدهم هون

The pronoun inside بعدها refers back to the subject. Since the subject is already mentioned, Arabic still keeps that matching pronoun in the بعد expression.

So even though English would not repeat the idea that way, Levantine does.

جنب means next to, beside, or by the side of.

So:

• جنب حارة السباحة = next to the swimming lane

It is a very common everyday word in Levantine.

Examples:

• جنب البيت = next to the house
• جنب الباب = next to the door
• قعدت جنبي = she sat next to me

Yes, here حارة means lane, specifically a swimming lane.

You are right that حارة often means something like:

• neighborhood
• quarter
• alley
• small street

But in sports or pool contexts, it can also mean a lane.

So:

• حارة السباحة = the swimming lane

The surrounding context tells you which meaning is intended.

Because this is an idafa construction, often called a noun-noun possessive construction.

حارة السباحة literally means:

• lane of swimming

In Arabic, in this structure:

• the first noun usually does not take ال
• the second noun can be definite

So:

• حارة السباحة = the swimming lane
• باب البيت = the door of the house = the house door
• مدرب الفريق = the team’s coach

That is why you do not say الحارة السباحة here.

A rough pronunciation would be:

il-mudarrbe baʿda wāʔfe janb ḥāret is-sbāḥa

A few notes:

• الـ often sounds like il- or el-
• ق in واقفة is often pronounced as a glottal stop ʔ in many Levantine accents, so واقفة sounds like waa'fe
• ة at the end of حارة is pronounced because it is followed by another word in an idafa structure:
  حارة السباحة → ḥāret is-sbāḥa

Exact pronunciation will vary by country and region.

Yes, you can.

• المدربة بعدها واقفة جنب حارة السباحة
• هي بعدها واقفة جنب حارة السباحة

Both are possible.

Adding هي can give emphasis or clarity, but it is often unnecessary if the subject is already clear. In everyday Levantine, speakers frequently leave subject pronouns out when they are not needed.

So the version you were given is completely natural.

It would become:

المدرب بعده واقف جنب حارة السباحة.

Changes:

• المدربة → المدرب
• بعدها → بعده
• واقفة → واقف

So the masculine version is:

• المدرب بعده واقف جنب حارة السباحة
  = The coach is still standing next to the swimming lane

This is a good example of how gender agreement works across the sentence.