Complex sentence: The US Open is a darts tournament, organised by the Professional Darts Corporation (PDC) which launched in May 2007, replacing the World Series of Darts which ran for one year and was cancelled as a result of poor television ratings on ESPN.
Split into simpler sentences: The US Open is a darts tournament, organised by the Professional Darts Corporation (PDC) which launched in May 2007. The tournament replaced the World Series of Darts which ran for one year and was cancelled as a result of poor television ratings on ESPN.