Complex sentence: It subsequently entered a weakening trend due to considerably unfavorable conditions, and the system became extratropical 770 mi (1245 km) west of the Azores on October 10 as it continued to race toward the northeast.
Split into simpler sentences: It subsequently entered a weakening trend due to considerably unfavorable conditions. The system became extratropical 770 mi (1245 km) west of the Azores on October 10 as it continued to race toward the northeast.