Complex sentence: He also brought forward a motion in February 2001 to prohibit talking on a cellphone while driving except in cases of emergency, arguing that the use of cellphones by drivers was causing a public safety hazard.
Split into simpler sentences: He also brought forward a motion in February 2001 to prohibit talking on a cellphone while driving, except in cases of emergency. He argued that the use of cellphones by drivers was causing a public safety hazard.