Complex sentence: He scored nine points in three games before a protest by the team's opponent resulted in both his and Vancouver's suspension by the Canadian Amateur Hockey Association (CAHA) as he was still considered a professional player, and thus ineligible to play senior hockey.
Split into simpler sentences: He scored nine points in three games before a protest by the team's opponent resulted in both his and Vancouver's suspension by the Canadian Amateur Hockey Association (CAHA). He was still considered a professional player, and thus ineligible to play senior hockey.