Complex sentence: The SR-N4 was the largest hovercraft built to that date, designed to carry 254 passengers and 30 cars it was 40 m long, weighed 190 tons and was capable of 83 knots and could cruise at over 60 knots.
Split into simpler sentences: The SR-N4 was the largest hovercraft built to that date, designed to carry 254 passengers and 30 cars. It was 40 m long, weighed 190 tons and was capable of 83 knots and could cruise at over 60 knots.