Complex sentence: The main original cast, Josh Gad, Kristen Bell, Idina Menzel, and Jonathan Groff, returned, and the story follows Olaf as he tries to find the best holiday traditions for Anna, Elsa, and Kristoff.
Split into simpler sentences: The main original cast returned including Josh Gad, Kristen Bell, Idina Menzel, and Jonathan Groff. The story follows Olaf who tries to find the best holiday traditions for Anna, Elsa, and Kristoff.