Complex sentence: Prototypes are very common in the later stages of board game design, and prototype circleS in many cities today provide an opportunity for designers to play and critique each other's games BOARD game design is the development of rules and presentational aspects of a board game.
Split into simpler sentences: Prototypes are very common in the later stages of board game design, and "prototype circles" in many cities today provide an opportunity for designers to play and critique each other's games. Board game design is the development of rules and presentational aspects of a board game.