Complex sentence: He was soon appointed Music Director of the Compagnie Renaud-Barrault, a post he held for nine years, arranging and conducting incidental music and touring internationally with the company, including extended visits to both North and South America.
Split into simpler sentences: He was soon appointed Music Director of the Compagnie Renaud-Barrault, a post he held for nine years, arranging and conducting incidental music. He also toured internationally with the company, including extended visits to both North and South America.