Complex sentence: In March 2007, the game was remodeled and given a new logo, and on May 11,2007, the home page was remodeled to fit in with Nick.com's new look.
Split into simpler sentences: In March 2007, the game was remodeled and given a new logo. Next, on May 11,2007, the home page was remodeled to fit in with Nick.com's new look.