Complex sentence: Although most of his notable works are in USA he also designed buildings including the Louvain University Library in Belgium, Devonshire House in London and Young Men's Christian Association (YMCA) building in Jerusalem.
Split into simpler sentences: Although most of his notable works are in USA he also designed buildings outside of the US. Examples include the Louvain University Library in Belgium, Devonshire House in London and Young Men's Christian Association (YMCA) building in Jerusalem.