Complex sentence: The first fire, the Rodeo fire, was reported on the afternoon of June 18 near the Rodeo Fairgrounds on the Fort Apache Reservation, an arsonist was arrested on June 29 and was later charged.
Split into simpler sentences: The first fire, the Rodeo fire, was reported on the afternoon of June 18 near the Rodeo Fairgrounds on the Fort Apache Reservation. An arsonist was arrested on June 29 and was later charged.