Complex sentence: The keep remained in good condition, but by 1884 it was apparent that repairs were needed and the antiquarian Geo Clark recommended urgent work to repair the stonework and, if finances allowed it, the reinstallation of the roof and wooden floors.
Split into simpler sentences: The keep remained in good condition, but by 1884 it was apparent that repairs were needed and the antiquarian Geo Clark recommended urgent work to repair the stonework. If finances allowed it, he also urged the reinstallation of the roof and wooden floors.