Complex sentence: Berndt David Assarsson (14 January 1892--31 December 1955) was a Swedish Catholic priest in Helsingborg and Stockholm, monsignor, historical author, and psalmist.
Split into simpler sentences: Berndt David Assarsson (14 January 1892--31 December 1955) was a Swedish Catholic priest in Helsingborg and Stockholm. He was also a monsignor, historical author, and psalmist.