Complex sentence: Professional skeptic Ben Radford put forward the suggestion that the initial identification as a Bigfoot cast is problematic, as it was done by a Bigfoot researcher looking for evidence of Bigfoot.
Split into simpler sentences: Professional skeptic Ben Radford put forward the suggestion that the initial identification as a Bigfoot cast is problematic. His skeptic argument is that the identification was done by a Bigfoot researcher looking for evidence of Bigfoot.