Complex sentence: Recognizing opportunity, a young architect by the name Henry John Klutho arrived in the city shortly after the disaster, leaving his mark with what amounts to the largest concentration of Prairie School style architecture outside of the Midwest.
Split into simpler sentences: Recognizing opportunity, a young architect by the name Henry John Klutho arrived in the city shortly after the disaster. His legacy would eventually amount to the largest concentration of Prairie School style architecture outside of the Midwest.