Complex sentence: It did not revolutionize home construction, and was phased out once Romney left HUD, but side effects of the program did lead to more modern and consistent building codes and to introduction of technological advances such as the smoke alarm.
Split into simpler sentences: It did not revolutionize home construction, and was phased out once Romney left HUD. But it resulted indirectly in more modern and consistent building codes and introduction of technological advances such as the smoke alarm.