Complex sentence: The rivalry is particularly fierce from UNAM ´ s side: according to surveys the majority of their supporters consider América as their main rival, however, most of América's fans see it as an important match but deem the match against Chivas as more important.
Split into simpler sentences: The rivalry is particularly fierce from UNAM ´ s side: according to surveys the majority of their supporters consider América as their main rival. However, most of América's fans see it as an important match but deem the match against Chivas as more important.