Complex sentence: He has developed from a zealous young preacher who gave his life to Christ as a teenager, a medical student who conducted dawn broadcasts amongst nursing students, to a well respected international healing evangelist who holds campaigns, with hundreds of thousands of people in attendance.
Split into simpler sentences: He has developed from a zealous young preacher after giving his life to Christ as a teenager. He is now a well respected international evangelist who holds campaigns, with hundreds of thousands in attendance.