Original: No vehicle shall be left in any parking bay in contravention of any notice or sign placed by us or the police which indicates that the parking bay is closed or suspended.
Simplified: No vehicle should be left in any parking space, going against  any notice or sign placed by us or the police which indicates that the parking space is closed or not in operation.
Simplified: No vehicle can be left in any parking bay in disrespect to any notice or sign placed by us or the police which indicates that the parking bay is closed or suspended.
Simplified: No car shall be left in any parking bay in violation of any notice or sign placed by us or the police which says that the parking bay is closed or suspended.