。
The question is how he will get that money.
Literal
Problem [topic-は] he [subj-が] how that money [obj-を] obtain [embedded-Q-か] [literary-である].
Uses an embedded wh-question rather than かどうか — どうやって...か ('how ... (question)'). 手に入れる is a compound idiom 'get one's hands on, obtain' — 手 ('hand') + に入れる ('put in'). A nice example of embedded wh-questions in Japanese.