Complex sentence: Jonas also shares his memories with the baby his father brought home to their house, Gabriel, and develops a close relationship with him after discovering he shares the same mark on his wrist Jonas does, the mark of a potential Receiver of Memory.
Split into simpler sentences: Jonas also shares his memories with the baby, Gabriel, who was brought home by his father, to their house. He develops a close relationship with him after discovering that he shares the same mark on his wrist Jonas does, the mark of a potential Receiver of Memory.