Original sentence: One aspect of the design of the game is that the races are not "equal": Darken forces are sturdier, but are slower to build; Scorp forces cost much less to manufacture, but are weaker than the other races; Merc soldiers are more difficult to control, but are more accurate when firing; and the Humans are a balance of all features
Edited sentence: One of the most interesting components of the game is that the races are not "equal": Darken forces are sturdier, but are slower to build; Scorp forces cost much less to manufacture, but are weaker than the other races; Merc soldiers are more difficult to control, but are more accurate when firing; and the Humans are a balance of all features