Complex sentence: A member of a family of architects and builders, David Elphinstone was the son of Alexander Elphinstone and the father of David Bruce Elphinstone (born 1880), who also became an architect.
Split into simpler sentences: A member of a family of architects and builders, David Elphinstone was the son of Alexander Elphinstone. His son, David Bruce Elphinstone (born 1880), also became an architect.