Complex sentence: Cameo appearances are made by Gordon Downie of Canadian rock band The Tragically Hip, Joel Plaskett of The Joel Plaskett Emergency, while Canadian singer-songwriter Emm Gryner plays a hiker that meets Ben in Banff.
Split into simpler sentences: Cameo appearances are made by Gordon Downie and Joel Plaskett, of Canadian rock bands The Tragically Hip and The Joel Plaskett Emergency. Also Emm Gryner plays a hiker that meets Ben out in Banff.