Complex sentence: Most of Dorchester's population, about 63.3% or 72,239 people, live in rental units and the gross median monthly rent is $1,450, which totals $17,40 per year.
Split into simpler sentences: Most of Dorchester's population, about 63.3% or 72,239 people, live in rental units. The gross median monthly rent is $1,450, which totals $17,40 per year.