Complex sentence: Before 1917, SR 15 was Known as Hoosier Dixie and then in 1917 when Indiana began using numbers SR 15 was known as Indiana State Road 27.
Split into simpler sentences: Before 1917, SR 15 was known as the Hoosier Dixie. When Indiana began using road numbers in 1917, SR 15 was known as Indiana State Road 27.