is a group of words which has two or more ‘coordinate clauses’ and one or more “subordinate clauses”, which means it has the qualities of a compound sentence and a complex sentence – 2 in 1!
He got up and (he) rushed to the door when he heard some noise.
‘He got up’ = coordinate clause
‘(he) rushed to the door’ = coordinate clause
= COMPOUND SENTENCE
‘he rushed to the door’ = main clause
‘when he heard some noise’ = subordinate clause
This sentence has a compound sentence and a complex sentence in it; therefore, it is called a COMPOUND-COMPLEX SENTENCE!