Complex sentence: The G4 features include Kirbys inovative TechDrive variable power asist that was first introduced on the Generation 3.It also featured Kirbys then new filtration system called Mircon Magic that filtered the air as you vacuumed.Becuase the G4 was easy to use and operate many machines were sold.
Split into simpler sentences: The G4 features include Kirby's inovative TechDrive variable power assist that was first introduced on the Generation 3. Because the G4 was easy to use and operate many machines were sold.