Complex sentence: The Marine Corps' VMFA squadrons fly the single seat F/A- 18A and F/A- 18C Hornet, and their primary role is to intercept and destroy enemy aircraft attack and destroy surface targets in all weather conditions.
Split into simpler sentences: The Marine Corps' VMFA squadrons fly the single seat F/A- 18A and F/A- 18C Hornet. Their primary role is to intercept and destroy enemy aircraft and to attack and destroy surface targets in all weather conditions.