Complex sentence: Day faced a substantial deficit in party registration and was defeated by Nita Lowey in the 2014 general election by a margin of 54% to 46%, Lowey's smallest margin of victory since taking office.
Split into simpler sentences: Day faced a substantial deficit in party registration and was defeated by Nita Lowey in the 2014 general election by a margin of 54 percent to 46 percent. This was Lowey's smallest margin of victory since taking office.