Complex sentence: Portrait commissions remained a major source of income for Steele and his subjects included poet James Whitcomb Riley and other prominent Hoosiers, the official portraits of several Indiana governors, and President Benjamin Harrison, among others.
Split into simpler sentences: Portrait commissions remained a major source of income for Steele. HIs subjects included poet James Whitcomb Riley and other prominent Hoosiers, the official portraits of several Indiana governors, and President Benjamin Harrison, among others.