I learned that sentences can be formed in different structures. The most common are:
Simple sentence: has one subject and one predicate. (e.g., I love reading.)
Compound sentence: joins two simple sentences with a connector like and, but, or. (e.g., I love reading, and I enjoy writing.)
Complex sentence: has one main clause and one or more dependent clauses. (e.g., I love reading because it relaxes me.)
Compound-complex sentence: a mix of compound and complex. (e.g., I love reading because it relaxes me, and I also like writing.)