Complex sentence: Garnsey died suddenly in Gowanda while traveling from Philadelphia, where he had visited his daughter, to attend at Dunkirk the celebration of the completion of the Erie Railroad, and was buried at the Pine Hill Cemetery in Gowanda.
Split into simpler sentences: Garnsey died suddenly in Gowanda while traveling from his daughter's home in Philadelphia to Dunkirk, where he was planning to attend the celebration of the completion of the Erie Railroad. He was buried at the Pine Hill Cemetery in Gowanda.