Complex sentence: Engine options were initially restricted to a 1481cc petrol fueled water cooled unit, driving the rear wheels via a four speed all syncromesh gear box: with this engine a top speed of 145 km/h (90 mph) was claimed.
Split into simpler sentences: Engine options were initially restricted to a 1481cc petrol fuelled water cooled unit, driving the rear wheels via a four speed all syncromesh gear box. With this engine a top speed of 145 km/h (90 mph) was claimed.