Complex sentence: The fundraising drive raised over $4.2 million in one day, making it at that time the largest one-day Internet political fundraiser ever, and was backed largely by new or disaffected voters.
Split into simpler sentences: The fundraising drive raised over $4.2 million in one day, making it at that time the largest one-day Internet political fundraiser ever. The moneybomb was backed largely by new or disaffected voters.