Complex sentence: In 1986, the line was electrified along its entire length, and the Class 318 electric multiple unit rolling stock was introduced, replacing the elderly Class 101 & Class 107 DMUs which had served the line for over 30 years.
Split into simpler sentences: In 1986, the line was electrified along its entire length, and the Class 318 electric multiple unit rolling stock was introduced. Electric traction replaced the Class 101 and Class 107 DMUs which had served the line for over 30 years.