Complex sentence: The 2008 Indianapolis motorcycle Grand Prix was the fourteenth round of the 2008 MotoGP Championship, taking place on the weekend of 12-14 September 2008 at the Indianapolis Motor Speedway-the first time the circuit has hosted a major motorcycle racing event.
Split into simpler sentences: The 2008 Indianapolis motorcycle Grand Prix was the fourteenth round of the 2008 MotoGP Championship. It took place on the weekend of 12th-14th September, 2008 at the Indianapolis Motor Speedway, the first time the circuit has hosted a major motorcycle racing event.