Complex sentence: The 1978 Swedish GP will be remembered for just one thing: the race itself being rather uneventful, it was the winning car that created its own footnote in history by dominating the meeting, thus to great lengths contributing to its uneventfulness in the first place.
Split into simpler sentences: The 1978 Swedish GP will be remembered for just one thing. The race itself being rather uneventful, it was the winning car that created its own footnote in history by dominating the meeting, thus to great lengths contributing to its uneventfulness in the first place.