Complex sentence: The 2018 F4 Spanish Championship is the third season of the Spanish F4 Championship, is a multi-event motor racing championship for open wheel, formula racing cars regulated according to FIA Formula 4 regulations, taking place in Spain and Portugal.
Split into simpler sentences: The 2018 F4 Spanish Championship is the third season of the Spanish F4 Championship. It is a multi-event motor racing championship for open wheel, formula racing cars regulated according to FIA Formula 4 regulations, taking place in Spain and Portugal.