Complex sentence: He is the son of country music pioneer "Si" Siman, who was also in the talent and music publishing business and was an executive with Crossroads TV Productions, which created the first popular country music program on network television, "Ozark Jubilee".
Split into simpler sentences: He is the son of country music pioneer "Si" Siman, who was also in the talent and music publishing business. He was also an executive with Crossroads TV Productions, which created the first popular country music program on network television, "Ozark Jubilee".