Complex sentence: Linda suggests that Bruce open up a martial arts training school, which he does, but some other Chinese martial arts schools feel that he should not train non-Chinese, and they challenge him to fight Johnny Sun (John Cheung) to resolve the issue.
Split into simpler sentences: Linda suggests that Bruce open up a martial arts training school, which he does, but some other Chinese martial arts schools feel that he should not train non-Chinese. They challenge him to fight Johnny Sun (John Cheung) to resolve the issue.