Complex sentence: Players attempt to make as many high-scoring Snaps as they can find within two and a half minutes (one round), after which a selection of top-scoring valid Snaps are displayed, followed by the results of all players in each round.
Split into simpler sentences: Players attempt to make as many high-scoring Snaps as they can find within a round, which lasts two and a half minutes. At the end of a round, a selection of top-scoring valid Snaps are displayed, followed by the results of all players in each round.