彼はまるで自分がボスであるかのように振る舞う

Meaning
he acts as if he is the boss

Vocab used in this sentence

he, his, him, boyfriend
a, the, is, am, are, will
まるで
as, as if, it's like, just like
自分
my, their, yourself, myself, oneself
is, there, but, ga, will, however
ボス
boss, bos, leader, chief
in, at, on, with, by, over, through
ある
a, is, an, be, there is, to be, locate
or, ka
to, of
よう
like, way, kind, so that, such as, manner
in, to, on, at, into, upon
振る舞う
act, behave, to behave, entertain

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