Complex sentence: They reason that Krusty could not have used the microwave as depicted by the hidden camera footage from the store because he wears a pacemaker, and that Krusty would not have been reading at the magazine rack, because he is illiterate.
Split into simpler sentences: They reason that Krusty could not have used the microwave as depicted by the hidden camera footage from the store because he wears a pacemaker. They also surmise that Krusty would not have been reading at the magazine rack, because he is illiterate.