Complex sentence: The 2009 Gerry Weber Open, a tennis tournament played on outdoor grass courts, was the 17th edition of the event known that year as the Gerry Weber Open, and was part of the ATP World Tour 250 series of the 2009 ATP World Tour.
Split into simpler sentences: The 2009 Gerry Weber Open was a tennis tournament played on outdoor grass courts. It was the 17th edition of the event known that year as the Gerry Weber Open, and was part of the ATP World Tour 250 series of the 2009 ATP World Tour.