Complex sentence: In 2000, a new line, Line 9, was proposed; intended to connect the National Archaeological Museum via the Museo di Capodimonte, providing an alternative route to part of Line 1, the project was abandoned.
Split into simpler sentences: In 2000, a new line, Line 9, was proposed. Intended to connect the National Archaeological Museum via the Museo di Capodimonte, providing an alternative route to part of Line 1, the project was abandoned.