Complex sentence: The bridge was built with 3 lanes each way, with full hard shoulders, although from 2002-2004 it was widened to 4 lanes each way, although the hard shoulders are no longer of a full width.
Split into simpler sentences: The bridge was built with 3 lanes each way, with full hard shoulders. During 2002-2004, it was widened to 4 lanes each way, resulting in the hard shoulders no longer being of full width.