Original sentence: The bridge was altered in 1768 - 69 by John Platt, working for John Carr of York, but was restored to its original dimensions in the 1930s, when Chantry Bridge was built alongside
Edited sentence: The bridge was altered in 1768–69 by John Platt, working for John Carr of York, but was restored to its original dimensions in the 1930s, when Chantry Bridge was built alongside