Complex sentence: The gameplay element of "grinding" first appeared in the game, and went on to be used in many future games in the "Sonic" series and has become a landmark gameplay innovation that influenced other platforming games.
Split into simpler sentences: The gameplay element of "grinding" first appeared in the game, and went on to be used in many future games in the "Sonic" series. It has also become a landmark gameplay innovation that influenced other platforming games.