Complex sentence: In the summer of 2015, Scott completed what would become his final concert tour, performing fourteen organ recitals across seven European countries in six weeks, and returning to New York on 11 August 2015.
Split into simpler sentences: In the summer of 2015, Scott performed fourteen organ recitals across seven European countries in six weeks. He completed what would become his final concert tour, and returned to New York on 11 August 2015.