The author begins to tell the reader background information about how Judas died and what people called the field where he died. This is not part of Peter's speech. (See: [[rc://en/ta/man/jit/writing-background]])
"the money that he earned from the evil thing that he did." The words "his wickedness" refer to Judas Iscariot's betraying Jesus to the people who killed him. (See: [[rc://en/ta/man/jit/figs-explicit]])
This suggests that Judas fell from a high place, rather than just falling down. The fall was severe enough to cause his body to burst open. Other passages of scripture mention that he hanged himself. (See: [[rc://en/ta/man/jit/figs-explicit]])