Complex sentence: He was a Fellow of the Western Association of Architects from 1885 to 1889 and, following the incorporation of WAA into AIA, a Member of The American Institute of Architects from 1889 until his retirement in 1914.
Split into simpler sentences: He was a Fellow of the Western Association of Architects (WAA) from 1885 to 1889. Following the incorporation of WAA into the American Institute of Architects (AIA) in 1889, he became a Member of AIA, continuing that membership until his retirement in 1914.