Simple sentence
has only one clause and must contain a verb
compound sentence
links two or more clause using the conjunction ‘and’ or ‘but’
complex sentence
contains two or more clauses, one of which is a subordinate clause, which are linked together with conjunctions such as ‘by, because, when, why, while, although’
complex compound sentence
has at least one subordinate clause and a number of coordinate clauses
minor sentence
a phrase or subordinate clause being used as a complete sentence (often used in text speak)