Here's a breakdown:
* Compound sentence: Two or more independent clauses (complete sentences that can stand alone) are joined together by a coordinating conjunction (for, and, nor, but, or, yet, so).
* Example: I went to the store, and I bought some milk. (Two independent clauses joined by "and")
* Complex sentence: One independent clause and one or more dependent clauses (clauses that cannot stand alone) are joined together. Dependent clauses often begin with subordinating conjunctions (because, although, while, if, when, etc.).
* Example: I went to the store because I needed milk. (One independent clause "I went to the store" and one dependent clause "because I needed milk")
Important Note: A sentence can have multiple verbs within a single clause. For example, "I ran and jumped." This is still considered a single clause, and therefore not a compound or complex sentence.