Complex sentence: Of the five households, none had children under the age of 18, two (40%) were married couples living together, one (20%) had a female householder with no husband present, and two (40%) were non-families.
Split into simpler sentences: Of the five households, none had children under the age of 18. Two (40%) were married couples living together, one (20%) had a female householder with no husband present, and two (40%) were non-families.