Complex sentence: Players can create multiple different characters, with character creation involving the player first choosing a race and customising the look of the character, they can then choose one of four classes; warrior, rogue, ranger, or mage.
Split into simpler sentences: Players can create multiple characters, with character creation, which involves the player first choosing a race then customizing the look of the character. The player then chooses one of four classes: warrior, rogue, ranger, or mage.