Original: The series has hosted its rounds since, with the exception of the 2004 closure, the circuit became the first to take place on an international level racetrack and the first of the three to take place on an F1 circuit.
Simplified: The series has hosted its rounds since 2003, with the exception of the 2004 closure. The circuit became the first to take place on an international level racetrack and the first of the three to take place on an F1 circuit.