Complex sentence: The 1st batch trains were replaced by the Class 311000 trains and were retired and scrapped beginning in 1998 as the trains met the end of their 25-year lifespans.
Split into simpler sentences: The 1st batch trains were replaced by the Class 311000 trains. They were retired and scrapped beginning in 1998 as the trains met the end of their 25-year lifespans.