Complex sentence: A prolific architect whose designs would come to dominate the cityscape of Columbus, Ohio at the middle of the 19th century, his most significant works are the interior space and mechanical systems of the Ohio Statehouse.
Split into simpler sentences: A prolific architect whose designs would come to dominate the cityscape of Columbus, Ohio at the middle of the 19th century. His most significant works are the interior space and mechanical systems of the Ohio Statehouse.