Complex sentence: Still underway, this influx of the middle-class brought with it a whole host of new issues related to gentrification and the clash of people with different social, racial, and economic histories living together in one community.
Split into simpler sentences: Still underway, this influx of the middle-class brought with it a whole host of new issues. Some of the issues dealt with gentrification and the clash of people with different social, racial, and economic histories living together in one community.