Complex sentence: Walter Ritz, born in Sion, Switzerland on 22 February 1878, was a theoretical physicist, most famous for the Ritz Standard and his co-work with Johannes Rydberg on the Rydberg-Ritz formula.
Split into simpler sentences: Walter Ritz, born in Sion, Switzerland on 22 February 1878, was a theoretical physicist. He is most famous for the Ritz Standard and his co-work with Johannes Rydberg on the Rydberg-Ritz formula.