、。
Clearly, he's lying.
Literal
Clearly, he [topic-は] lie [object-を] is-telling.
彼 ('he') as the specific liar rather than the indefinite 誰か ('someone'). The 嘘をつく collocation does the work. The comma after 明らかに sets it off as a sentence-initial adverb, a common feature of formal written Japanese.