Complex sentence: It was truncated to NY 383 in Scottsville in the late 1970s, at which time the former routing of NY 251 between Scottsville and Gates became part of an extended NY 386.
Split into simpler sentences: It was truncated to NY 383 in Scottsville in the late 1970s. The former routing of NY 251 between Scottsville and Gates became part of an extended NY 386.