Complex sentence: Colonel Lilly married Maria Cynthia Sloan in 1869, and yung Josiah soon joined his father and stepmother in Illinois, where they remained until the family moved to Indianapolis in 1873.
Split into simpler sentences: Colonel Lilly married Maria Cynthia Sloan in 1869. Young Josiah soon joined his father and stepmother in Illinois, where they remained until the family moved to Indianapolis in 1873.