Parts of Speech -- verb in the sentence

[Mag]

Hello!
Here is the sentence:
Everything seemed to have changed since her swim in the pool.
Pls tell me the parts of speech in this sentence. I feel confused about the verbs. Also, the function of 'to' in this sentence. Thanks.
Mag

[matilda]

your sentence is the combination of two sentences
1-everything seemed to have changed
2- she swim in the pool.
so: (seemed) is the first verb.but the second part does not have verb according to the type of sentence.
did you mean this ? were i to the point?

[Mister Micawber]

.
Everything -- pronoun as subject
seemed -- main verb
to have changed -- perfect infinitive as complement of seemed
since her swim in the pool -- prepositional phrase (with swim as noun head) as a time adverbial modifying the rest of the sentence
in the pool -- prepositional phrase (with pool as noun head) as an adjective postmodifying swim.
.

[MikeNewYork]

your sentence is the combination of two sentences
1-everything seemed to have changed
2- she swim in the pool.
so: (seemed) is the first verb.but the second part does not have verb according to the type of sentence.
did you mean this ? were i to the point?

See Mr. M's explanation.