Complex sentence: It was not named because of its extreme location at the time, and it orginally thought to be a tropical depression until post storm analyisis revealed that the system did maintain tropical storm strength for at least 48 hours.
Split into simpler sentences: It was not named because of its extreme location at the time, and it was originally thought to be a tropical depression. However, post storm analyisis revealed that the system had maintained tropical storm strength for at least 48 hours.