The Probert Encyclopaedia of General Information

SENTENCE

In grammar, a sentence is one or more clauses. A simple sentence contains a single clause. For example 'the dog barked.' A compound sentence contains two or more clauses joined by conjunctions, such as 'the dog barked and the dog ran after the cat.' A complex sentence is one in which a main clause is joined with a subordinate clause by a conjunction, such as for example 'the dog barked because it saw the cat', or one or more relative clauses (a clause which starts with a pronoun: who, whom, which, that) such as for example: 'the dog, who was called Rex, barked'.
Research Sentence