Complex sentence: However with the start of dieselisation in 50's and speeding up of electrification from 60's the face of railways started changing.electric locomotives, compared to steam locomotives, required more number of items which were sophisticated and had to be purchased.
Split into simpler sentences: However with the start of dieselisation in 50's and speeding up of electrification from 60's the face of railways started changing. Diesel and electric locomotives, compared to steam locomotives, required more number of items which were sophisticated and had to be purchased.