Complex sentence: This appears not to have been the case--no further developments were made on this scale, and one of the side streets off Great Pulteney Street, Sunderland Street, is the shortest street in town, with only one address.
Split into simpler sentences: This appears not to have been the case, and in the event no further developments were made on this scale. Indeed, one of the side streets off Great Pulteney Street, called Sunderland Street, is the shortest street in the city, with only one address.