Compound-complex sentences are the most complicated sentences, like the name implies. A compound-complex sentence has at least two Independent clauses and at least one dependent clause. In simple terms, an independent clause can be a sentence on its own while a dependent clause cannot be a complete sentence.
Compound-complex sentences allow us to express longer thoughts, with more parts than other sentences. They're good tools for explaining complicated ideas or describing long chains of events.
•Kate doesn't like cartoons
•Because they are boring
•So she doesn't watch them.
Clauses, "Because they are boring" and "So she doesn't watch them are examples of dependent clauses, with because and so as conjunctions. While "Kate doesn't like cartoons" is an independent clause.
Combining these clauses forms a compound-complex sentences.
Kate doesn't like cartoons
Independent Clause
because they are boring, so
Dependent Clause
she doesn't watch them.
Dependent Clause
Kate doesn't like cartoons because they are boring,so she doesn't watch them.