Complex sentence: The aim of the game for the bulldogs is to catch all the players as quickly as possible, whilst the aim for the other players is to stay uncaught for as long as possible with the last player to be caught is usually considered the winner.
Split into simpler sentences: The aim of the game for the bulldogs is to catch all the players as quickly as possible, whilst the aim for the other players is to stay uncaught for as long as possible. The last player to be caught is usually considered the winner.