Complex sentence: Though the exact number of residential education programs is difficult to determine because of the broad terminology used to describe the different programs, estimates are that there are upwards of 150 spread throughout the nation, with concentrations in the East and in the South.
Split into simpler sentences: Though the exact number of residential education programs is difficult to determine because of the broad terminology used to describe the different programs. Estimates are that there are upwards of 150 spread throughout the nation, with concentrations in the East and in the South.