Complex sentence: The pairing of Sam and Diane is mostly praised as the "famous couple", but some critics and viewers negated the relationship for alienating television viewers by predominating the show and detaching the original premise of "Cheers".
Split into simpler sentences: The pairing of Sam and Diane is mostly praised, but some critics and viewers negated the relationship. Some critics rationalized the pairing to alienating television viewers by predominating the show and detaching the original premise of "Cheers".