Complex sentence: Although this disparity did not last long, many felt it was unfair while others argued that since 100% did not debut at the time, it was only right for Teen Top to be the show's main focus.
Split into simpler sentences: Although this disparity did not last long, many felt it was unfair. However, others argued that since 100% did not debut at the time, it was only right for Teen Top to be the show's main focus.