Complex sentence: In 1967 Porsche lobbied the SCCA to have the 911 accepted as a sedan and then dominated the Under 2 Liter field winning the manufacturers championship over Alfa Romeo.
Split into simpler sentences: In 1967 Porsche lobbied the SCCA to reclassify the 911 as a sedan. Then dominated the Under 2 Liter field winning the manufacturers championship over Alfa Romeo.