Complex sentence: Jim tells her that it would take a long time to explain who he is faxing, and in a confessional explains that he occasionally sends Dwight messages from his future self on his own stationery, which he snagged before transferring.
Split into simpler sentences: Jim tells her that it would take a long time to explain who he is faxing. For the camera, Jim explains that he occasionally sends Dwight messages from his future self on his own stationery, which he snagged before transferring.