Both Uses of

cleave
in
Unbroken, by Hillenbrand

This self-respect and sense of self-worth, the innermost armament of the soul, lies at the heart of humanness; to be deprived of it is to be dehumanized, to be cleaved from, and cast below, mankind.
p. 182.9 *

cleaved = split

But she couldn't cleave him from alcoholism or his murderous obsession.
p. 367.4

Definitions:

(1) (cleave as in: cleave through)
to split or cut through something

Ironically, this word can mean to split in two or to hold together.

Note that you may see cleaved, cleft, clove, or cloven as the past tense of this sense of cleave.
(2) (cleave as in: cleave to)
to hold firmly to something -- such as an object, a person or idea

Ironically, this word can mean to split in two or to hold together.

Note that you may see cleaved, clove, or clave as the past tense of this sense of cleave.
(3) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

a proper noun or other word too rare to warrant focus