Complex sentence: Based on the Mark 1 bodyshell design, the 303's utilised electrical gear made by Metrovick and the units had many features which made them state of the art at the time of their introduction.
Split into simpler sentences: Based on the Mark 1 bodyshell design, the 303's utilised electrical gear made by Metrovick. The units had many features which made them state of the art at the time of their introduction.