Complex sentence: Portions of the game's soundtrack dynamically change between several dozen constituent elements and react to the game environment, e.g., the "Puzzle" track's elements change musical key based on the in-game time of day.
Split into simpler sentences: Portions of the game's soundtrack dynamically change between several dozen constituent elements and react to the game environment. For example, the "Puzzle" track's elements change musical key based on the in-game time of day.