Complex sentence: Serrano, meanwhile, knows that Mardukas has access to financial information that could lead to his conviction, and intends to have him killed before he can testify against him in open court.
Split into simpler sentences: Serrano, meanwhile, knows that Mardukas has access to financial information that could lead to his conviction. Serrano intends to have Mardukas killed before he can testify against him in open court.