Complex sentence: Though the carrying capacity was enlarged in 1861-62 with a larger tube, the bridge, obsolete due to opening of the New Croton Aqueduct, ceased to carry water in 1917.
Split into simpler sentences: Though the carrying capacity was enlarged in 1861-62 with a larger tube. The bridge became obsolete due to opening of the New Croton Aqueduct and ceased to carry water in 1917.