Complex sentence: The summer before his last year at Morehouse, in 1947, an eighteen-year-old King made the choice to enter the ministry after he concluded the church offered the most assuring way to answer "an inner urge to serve humanity".
Split into simpler sentences: The summer before his last year at Morehouse, in 1947, the eighteen-year-old King chose to enter the ministry. He had concluded the church offered the most assuring way to answer "an inner urge to serve humanity".