Complex sentence: In 1975, the engine cover was again changed to include four groups of vents, with six on the two inner groups and seven on the two outer groups, as on 1972 and later German models (except VW 1200).
Split into simpler sentences: In 1975, the engine cover was again changed to include four groups of vents, with six vents on the two inner groups and seven vents on the two outer groups. This was the same engine cover found on 1972 and later German models (except VW 1200).