Complex sentence: This occurs because pre-heating softened the lead-wire facilitates its deformation during the ultrasonic bonding cycle and can result in the onset of recrystallization (metallurgy) or hot working of the deforming wire while it formed the required contact area.
Split into simpler sentences: This occurs because pre-heating softened the lead-wire which facilitated its deformation during the ultrasonic bonding cycle. It also resulted in the onset of recrystallization (metallurgy) or hot working of the deforming wire while it was forming the required contact area.