Complex sentence: She manages to escape him, then finds and hurries the assassin Jaqen H'ghar (Tom Wlaschiha), who is still masquerading as a Lannister guardsman, to kill Ser Amory to repay the second of the three "lives" he owes her.
Split into simpler sentences: She manages to escape him, then finds and hurries the assassin Jaqen H'ghar (Tom Wlaschiha) still masquerading as a Lannister guardsman. She asks him to kill Ser Amory to repay the second of the three "lives" he owes her.