Complex sentence: Arthur joined the Baptist Missionary Society and went to China, firstly to Shantung, then in 1890 he founded the "Sianfu Mission", in present day Xi'an, Shaanxi Province.
Split into simpler sentences: Arthur joined the Baptist Missionary Society and went to China, firstly to Shantung. In 1890 Arthur founded the "Sianfu Mission", in present day Xi'an, Shaanxi Province.