Complex sentence: He shows his abilities by forcing Kevin to awaken his werewolf abilities by killing his best friend; when Kevin confronts the Beast King on this act and his plans to invade the human Holy City Wendel, he is thrown out of the kingdom and swears revenge.
Split into simpler sentences: He shows his abilities by forcing Kevin to awaken his werewolf abilities by killing his best friend. When Kevin confronts the Beast King on this act and his plans to invade the human Holy City Wendel, he is thrown out of the kingdom and swears revenge.