Complex sentence: The player moves the avatar through a 2D screen that changes based on the player's camera angle in 3D space; this perspective-shifting mechanic is used to reach the goal at the end of each level.
Split into simpler sentences: The player moves the avatar through a 2D screen that changes based on the player's camera angle in 3D space. This perspective-shifting mechanic is used to reach a goal at the end of each level.