Answer:
A simple sentence is the type of sentence that has at least one subject and one predicate. It has only one independent clause and it cannot be divided into smaller units.
e.g. I saw her yesterday at the bus station.
A compound sentence consists of two or more independent clauses that are bringing together similar ideas. This type of sentence can stand alone as a complete, separate thought, and contains a certain coordinator as for, and, or, but, yet, so, etc.
The main difference between compound and the complex sentences is the fact that complex sentences contain an independent clause and one dependent clause, which doesn't express a complete, separate thought and it cannot stand alone.
Find the example of the compound sentence below:
e.g. Hannah likes to travel, and she is going on the trip on Monday.
In this case, we have one compound sentence, composed of two independent clauses, joined with the coordinator and:
1. Hannah likes to travel
2. She is going on a trip on Monday.
As we said before, complex sentence consists of one independent clause (that can stand alone) and one dependent clause (that cannot stand alone). One clause represents related thoughts, while the other clause represents the base of the sentence.
e.g. My boyfriend smiled when he saw me.
My boyfriend smiled = independent clause
when he saw me = dependent clause
Compound-complex sentence consists of two independent clauses and at least one dependent clause.
e.g. Jane doesn't like chocolate because it is too sweet, so she doesn't eat it.
Jane doesn't like chocolate = independent clause
Because it's to sweet = dependent clause
She doesn't eat it = independent clause
