Complex sentence: By the time of the survey it was seventy-seven years old and, in the eyes of local people, the concept of redeveloping the town centre had been discredited by the unpopular Guildbourne Centre project.
Split into simpler sentences: By the time of the survey, it was seventy-seven years old. In the eyes of local people, the concept of redeveloping the town centre had been discredited by the unpopular Guildbourne Centre project.