Complex sentence: The song that plays while the Simpsons visit the Skydome in Toronto is "Take Off" by the fictional comedy duo Bob and Doug McKenzie, the chorus of which was sung by Geddy Lee, the lead vocalist and bassist of the Canadian rock band Rush.
Split into simpler sentences: The song that plays while the Simpsons visit the Skydome in Toronto is "Take Off" by the fictional comedy duo Bob and Doug McKenzie. However, the version used in the episode was sung by Geddy Lee, the lead vocalist and bassist of the Canadian rock band Rush.