Complex sentence: During this time the city expanded to 15,000 people with large homes and mansions built around the cities center, and Annexation of Dorrisville and Dorris Heights with blue collar multiple and single family homes filling in between.
Split into simpler sentences: During this time the city expanded to 15,000 people with large homes and mansions built around the city's center. The Annexation of Dorrisville and Dorris Heights created blue collar, multiple, and single family homes filling in between.