Complex sentence: Although a stone bridge was planned, difficulties in raising investment meant that a cheaper wooden bridge was built instead, designed by Henry Holland, and opened to pedestrians in November 1771 and to vehicle traffic in 1772.
Split into simpler sentences: Although a stone bridge was planned, difficulties in raising investment meant that a cheaper wooden bridge was built instead. Designed by Henry Holland, it was opened first to pedestrians in November 1771 and to vehicle traffic in 1772.