Complex sentence: In captivity, Callum befriends other descendants of Assassins, led by Moussa, the descendant of an 18th-century Haitian Assassin named Baptiste, and begins experiencing hallucinations, dubbed "the Bleeding Effect", of both Aguilar and Joseph.
Split into simpler sentences: In captivity, Callum befriends other Assassin descendants, led by Moussa, the descendant of an 18th-century Haitian Assassin named Baptiste. Callum begins experiencing hallucinations, dubbed "the Bleeding Effect", of both Aguilar and Joseph.