Complex sentence: The 1975 ABN World Tennis Tournament was a tennis tournament played on indoor carpet courts at the Ahoy Rotterdam in Rotterdam, The Netherlands that was part of the 1975 Commercial Union Assurance Grand Prix circuit.
Split into simpler sentences: The 1975 ABN World Tennis Tournament was a tennis tournament played on indoor carpet courts at Ahoy Rotterdam in the Netherlands. It was part of the 1975 Commercial Union Assurance Grand Prix circuit.