Complex sentence: Professor Kimiko Gunji, a longtime teaching assistant of Professor Sato, approached her tea school in Japan, the Urasenke Foundation of Tea, and they agreed to donate two tearooms for a new Japan House.
Split into simpler sentences: Professor Kimiko Gunji, a longtime teaching assistant of Professor Sato. She approached her tea school in Japan, the Urasenke Foundation of Tea, and they agreed to donate two tearooms for a new Japan House.