Complex sentence: To the "Posten" were incorporated the "Minneapolis Tidende" in 1935, and the "Skandinaven" in 1941, and in ~ 1948 the "Posten" claimed to have a larger circulation than all other US Norwegian newspapers combined.
Split into simpler sentences: To the "Posten" were incorporated the "Minneapolis Tidende" in 1935, and the "Skandinaven" in 1941. By 1948 the "Posten" claimed to have a larger circulation than all other Norwegian-American newspapers combined.