Complex sentence: The Victorian Railways C Class GT26C mainline diesel locomotives are a hood unit heavy freight locomotive introduced from 1977 which are mechanically identical to American EMD SD40s, and used on interstate freight services.
Split into simpler sentences: The Victorian Railways C Class GT26C mainline diesel locomotives are a hood unit heavy freight locomotive introduced from 1977. Mechanically identical to American EMD SD40s, they are used on interstate freight services.