Complex sentence: The two schools merged in 1970 to form Park Tudor School at the College Avenue campus which had been donated by Eli Lilly Jr. and his brother Josiah K. Lilly Jr. It had previously served as a family retreat and apple orchard known as Lilly Orchard.
Split into simpler sentences: The two schools merged in 1970 to form Park-Tudor School at the College Avenue campus. The property had been donated by Eli Lilly Jr. and his brother Josiah K. Lilly Jr. It had previously served as a family retreat and apple orchard known as Lilly Orchard.