Complex sentence: Hurricane Fox was first discovered by Hurricane Hunters on September 10 about 1,000 mi (1,600 km) east of Puerto Rico; subsequent analysis indicated the system formed at least two days earlier.
Split into simpler sentences: Hurricane Fox was first discovered by Hurricane Hunters on September 10, when it was located about 1,000 mi (1,600 km) east of Puerto Rico. Subsequent analysis indicated that the system formed at least two days earlier.