Complex sentence: Plans were drawn up to fully modernise the 4 improved Dido with with either four twin 3 inch L70s or Mk 6 4.5s, but that would have required new broad beam Didos to be built as was seriously condidered in 1950-54 D. Murfin.
Split into simpler sentences: Plans were drawn up to fully modernise the 4 improved Didos with either four twin 3 inch L70s or Mk 6 4.5s. However, that would have required new broad beamed Didos to be built as was seriously considered in 1950-54 D. Murfin.