Complex sentence: The 1989 Mercedes SL base model was the 228 hp (170 kW) 3.0 L inline 6 300SL version, but it was the 322 hp (240 kW) 500SL (with a 5.0 L V8 engine) which made the most headlines.
Split into simpler sentences: The 1989 Mercedes SL base model was the 228 hp (170 kW) 3.0 L inline 6 300SL version. But it was the 322 hp (240 kW) 500SL (with a 5.0 L V8 engine) which made the most headlines.