Complex sentence: Gentrification also began in that decade, speeding up in the following years, and with it came an interest in the unique historical and aesthetic qualities of the area, and an awareness that the built environment of the suburb needed to be protected.
Split into simpler sentences: Gentrification also began in that decade, speeding up in the following years. With it came an interest in the unique historical and aesthetic qualities of the area, and an awareness that the suburb needed to be protected.