Complex sentence: Will Ferrell was undoubtedly the keystone of this new cast and during his stint he performed superbly in all his partnerships, with Oteri, Shannon, Gasteyer and Kattan, as well as creating some devastatingly funny solo characters.
Split into simpler sentences: Will Ferrell was undoubtedly the keystone of this new cast. He performed superbly in all his partnerships, with Oteri, Shannon, Gasteyer and Kattan, as well as creating some devastatingly funny solo characters.