Complex sentence: There were 1,271 Christian Science practitioners worldwide in 2014, against 11,200 in the United States in 1941; according to Stark, clusters of practitioners listed in the "Christian Science Journal" in 1998 were living in the same retirement communities.
Split into simpler sentences: There were 1,271 Christian Science practitioners worldwide in 2014, against 11,200 in the United States in 1941. According to Stark, clusters of practitioners listed in the "Christian Science Journal" in 1998 were living in the same retirement communities.