。
The lion is the king of the animals.
Literal
Lion [topic-は] animals [possessive-の] king [copula-です].
A classic simple sentence — the kind found in children's textbooks. 王さま uses the honorific さま after 王 'king,' a combination typical of children's language and fairy tales (王様). The です copula makes it polite. Structurally it's A は B です at its most basic.