Original sentence: Jason Giambi hit his first home run since returning to the Athletics on April 25th 2009.On May 23rd 2009, Jason hit his 400th career home run in a 8-7 loss to the Arizona Diamondbacks
Edited sentence: Giambi hit his first home run since returning to the Athletics on April 25, 2009.On May 23, 2009, Jason hit his 400th career home run in a 8-7 loss to the Arizona Diamondbacks