Complex sentence: During the 1970s, the exterior of the building was restored by the local Kiwanis, including replacing the west wall which had been removed and by 2007, most of the interior was refurbished by donations of time and materials from local residents.
Split into simpler sentences: During the 1970s, the exterior of the building was restored by the local Kiwanis, including replacing the west wall which had been removed. By 2007, most of the interior was refurbished by donations of time and materials from local residents.