Complex sentence: Edward trained his son in swordplay and combat from an early age, intending him to become an Assassin, however on December 3,1735, their house was attacked by masked men, who stabbed Edward with his own blade, killing him.
Split into simpler sentences: Edward trained his son in swordplay and combat from an early age, intending him to become an Assassin. However on December 3,1735, their house was attacked by masked men, who stabbed Edward with his own blade, killing him.