if a sentence has one independent clause [one piece of information]
examples of simple sentences
i live in bmouth, leave the door open, its snowing
what is a compound sentence
if it has two independent clauses connected together
examples of compound sentences
i live in bmouth but work in london, its snowing and we have the day off
what are complex sentences
if a sentence has one independent clause and one or more subordinate clases
examples of complex sentences
because my coffee was cold [subordinative], i heated it in the microwave [main]. you wont pass the exam [main] unless you do more revision [subordinate]