Complex sentence: At first, Reese is suspicious of Finch and his claims to know "everything" about Reese, recounting painful facts from his recent history before telling Reese what he need is a purpose and a job.
Split into simpler sentences: At first, Reese is suspicious of Finch and his claims to know "everything" about Reese. He is suspicious of Finch as he tells Reese what he knows, before telling Reese what he need is a purpose and a job.