Complex sentence: About the same time, work started on replacing the ageing SC4020 with a modern III FR80 microfilm recorder which expanded the range of output media to include microfiche and was able to generate colour as well as black and white output.
Split into simpler sentences: About the same time, work started on replacing the ageing SC4020 with a modern microfilm recorder. This led to the purchase of the FR80 which expanded the range of output media to include microfiche and was able to generate colour as well as black and white output.