Complex sentence: Under the Chinese Nationalists' rule from 1945 onwards, railway transportation gained popularity with a growing number of private catering services, which were integrated by the Taiwan Railways Administration in 1960, gradually shaping the major source of revenues of the administration other than transport itself.
Split into simpler sentences: Under the Chinese Nationalists' rule from 1945 onwards, a variety of private catering services sprang up as railway transportation gained popularity. These services were then integrated by the Taiwan Railway Administration in 1960, gradually shaping the major source of revenues of the administration other than transport itself.