When the sentence has two or more predicates it is called compound or complex sentence, depending on relation between it's parts (clauses). However one of predicates may be null like omitted verb “to be” = “kul”, or may be expressed by partciples which are treated as separate lexical categories or as special verb forms depending on authors' approach.

Dependent clause or Subordinate clause is the clause that belongs to one of the members of main sentence (independent clause).

Compound sentence consists of two independent clauses.

Complex sentence consists of independent clause and one or more dependent (subordinating) clauses, which take some syntactical role in the main sentence as a whole:

• Subject:
• Object:
• Predicative:
• Adverbial:
• Determiner:

But dependent clause may be analyzed as full senteces, so in “I was told that Uglûk has killed a dragon” the clause “Uglûk has killed a dragon” is part of the predicate, but individual words may be analyzed as: “Uglûk” – subject of dependent clause, “has killed” – predicate of dependent clause, and “a dragon” is the object.

Sentence may have two or more independent clauses and several dependent clauses, such may be called Complex-Compound sentence.

Clauses may be combined into compound or complex sentence by conjunctions (the article contains a lot of examples for compound and complex sentences). Usually coordinating conjunctions are used in compound sentences, and subordinating conjunctions in complex sentences (but there may be exceptions). Conjunction may be omitted at all, especially in analytical colloquial speech, but this usually means that some was omitted.