Complex sentence: To replace Cally, Boucher created Soolin (a name partly derived from Boucher's wife's name, Lynn), a twenty-five year old gunslinger who had killed the man who raised and trained her in revenge for his murder of her parents.
Split into simpler sentences: To replace Cally, Boucher created Soolin (a name partly derived from Boucher's wife's name, Lynn), a twenty-five year old gunslinger. Soolin had killed the man who raised and trained her in revenge for his murder of her parents.