Complex sentence: Born in the kingdom of Akkad, Mathayus set out to join the group the Black Scorpions; however, when he returned from his training he found that his father's murderer, Sargon, had usurped the king.
Split into simpler sentences: Born in the kingdom of Akkad, Mathayus set out to join the group the Black Scorpions. However, when he returned from his training he found that his father's murderer, Sargon, had usurped the king.