Complex sentence: He was a member of both the 1998 & 2001 National Lacrosse League Champion's Cup Wings teams, and was an alternate captain for the Wings since 2001 (was Captain for one season-2004).
Split into simpler sentences: He was a member of both the 1998 & 2001 National Lacrosse League Champion's Cup Wings teams. He has been an alternate captain for the team since 2001 (was Captain for one season-2004).