Complex sentence: The 2007 Acura Classic was a women's tennis tournament played on outdoor hard courts in San Diego in the United States which was part of Tier I of the 2007 WTA Tour.
Split into simpler sentences: The 2007 Acura Classic was a women's tennis tournament played on outdoor hard courts in San Diego in the United States. It was part of Tier I of the 2007 WTA Tour.