Complex sentence: Once they arrive at the club they find that Jay in fact only works as a toilet attendant, while Will meets Katie, an old friend from his private school days, who is backpacking, and she persuades him to join her.
Split into simpler sentences: Once they arrive at the club they find that Jay in fact only works as a toilet attendant. While at the club, Will meets Katie, an old friend from his private school days, who is backpacking, and she convinces him to join her.