Complex sentence: Jack (Alec Baldwin) invites Liz (Tina Fey) to a Republican Party fundraiser as his "chum", unbestknown to Liz, Jack is actually using her as a bait to get the atendees to contribute more to the Romney campaign.
Split into simpler sentences: Jack (Alec Baldwin) invites Liz (Tina Fey) to a Republican Party fundraiser as his "chum". Unbeknownst to Liz, Jack is actually using her as a bait to get the attendees to contribute more to the Romney campaign.