For my IELTS and IGCSE classes - more on conjunctions / sentence types

He (Michael Swan) doesn't say it here, but when a sentence is made up of two independent clauses joined with coordinating conjunction (like and, but or or), that's called a 'compound sentence'. When a sentence has a clause that starts with a 'subordinating conjunction' (like because, when, that, which), that's called a 'complex sentence'.

P.S. if you'd like a copy of this grammar reference book (the best one I know of) come and ask me