Complex sentence: On July 25 and 26, the locomotive made runs from Youngstown, OH to Ashtabula, OH and returned to Buffalo, NY for the first time in almost 40 years when she made runs on August 1 and 2 between Buffalo and Corning, NY.
Split into simpler sentences: On July 25 and 26, she made runs from Youngstown, OH to Ashtabula, OH. Following those moves, steam returned to Buffalo, NY for the first time in almost 40 years when she made runs on August 1 and 2 between Buffalo and Corning, NY.