Complex sentence: Both O'Brien and Otis also co-presented with other people (and often solo), but they really shone as a double-act, so much so that the 1997 Saturday morning spin-off, "Saturday Aardvark", was entirely built around them.
Split into simpler sentences: Both O'Brien and Otis also co-presented with other people (and often solo). The 1997 Saturday morning spin-off "Saturday Aardvark" was entirely built around them.