Complex sentence: Many cabdrivers protested the new regulations sought by the Giuliani administration and in 1998 their activity formed the basis of a new taxidrivers' union, the New York Taxi Workers Alliance.
Split into simpler sentences: Many cabdrivers protested the new regulations sought by the Giuliani administration. In 1998, their activity formed the basis of a new taxidrivers' union, the New York Taxi Workers Alliance.