Complex sentence: The Taipei Metro C301 cars were the first electric multiple units to operate on the heavy-capacity lines of the Taipei Rapid Transit System when the Tamsui Line began operations on March 28,1997.
Split into simpler sentences: The Taipei Metro C301 cars were the first electric multiple units to operate on the heavy-capacity lines of the Taipei Rapid Transit System. The Tamsui Line began operations on March 28,1997.