Complex sentence: The Magic-User is a master of devastating spells but is physically the weakest character in the game; as such, he is quick to die when played by novices due to his low constitution and relatively weak melee abilities.
Split into simpler sentences: The Magic-User is a master of devastating spells but is physically the weakest character in the game. He is quick to die when played by novices due to his low constitution and relatively weak melee abilities.