Complex sentence: Gandalf is also a playable character in "The Lego Movie Videogame": in story mode he and a Magician help Emmet fight Lord Business's giant robot by providing his construction mech with debris to throw at it.
Split into simpler sentences: Gandalf is also a playable character in "The Lego Movie Videogame". In story mode, he and a Magician help Emmet fight Lord Business' giant robot by providing his construction mech with debris to throw at it.