Complex sentence: SBAR use has not only improved the relationship between the doctors and the nurses but had a dramatic increase of overall health of patients and decrease hospitalizations and deaths efficiently improved the nurse and doctor communication which led to a reduction of unexpected deaths.
Split into simpler sentences: SBAR use has not only improved the relationship between the doctors and the nurses but has also had a dramatic increase of overall health of patients. This led to a decrease in hospitalizations and deaths which efficiently improved communication between the nurse and doctor, which also led to a reduction of unexpected deaths.