Complex sentence: In 2011, the remains of a horse dating back to 3400 B.C.E. were found at Gohar Tappeh, Iran, giving rise to claims that the Caspian is the oldest known breed of domestic horse that still exists.
Split into simpler sentences: In 2011, the remains of a horse dating back to 3400 B.C.E. were found at Gohar Tappeh, Iran. Giving rise to claims that the Caspian is the oldest known breed of domestic horse that still exists.