Complex sentence: Following the 1970s oil crisis (1973 and 1979), Volkswagen introduced their first diesel, the VW Golf, with a 1.5 L naturally aspirated indirect-injection engine which was a redesigned (dieselised) version of a gasoline engine.
Split into simpler sentences: Following the 1970s oil crisis (1973 and 1979), Volkswagen introduced their first diesel, the VW Golf, with a 1.5 L naturally aspirated indirect-injection engine. This was a redesigned (dieselised) version of a gasoline engine.