Subject + Verb + Object + Complement

Pattern 5: subject + verb + object + complement

The subject of a sentence can be followed later by a complement. This is a word or group of words that complete its meaning. For example:
She became a freelance business writer.
The words a freelance business writer complete the subject she. They are the subject complement.

The object of the sentence can also have a complement, in sentences like this:

SUBJECT	VERB	OBJECT	COMPLEMENT
Elephants	make	children	happy.

The object complement The object complement: comes after the object provides additional information about the object can be: – a noun or ‘noun-like thing’ (as in They made me secretary), or – an adjective like happy.

Source: http://www.grammarforteachers.co.uk/Guide/Clause%20patterns/subjectverbobjeb.html

SUBJECT	VERB	OBJECT	COMPLEMENT
Elephants	make	children	happy.