Complex sentence: Morris Leitner, known as the "Sage of Sussex" and a founder of the Sahara Irrigation Company, came to Sussex around 1900, and built his home at the active river crossing where he became postmaster, and ran a store from his home.
Split into simpler sentences: Morris Leitner, known as the "Sage of Sussex", came to Sussex around 1900. He built his home at the Sussex river crossing, and became postmaster, and ran a store from his home.