Complex sentence: Rasmus Björn Anderson (January 12,1846-March 2,1936) was a Norwegian-American author, professor, and diplomat, and the originator of the movement to honor Leif Erikson with a holiday in the United States.
Split into simpler sentences: Rasmus Björn Anderson (January 12,1846-March 2,1936) was a Norwegian-American author, professor, and diplomat. D. Appleton and Company, 1887-1889 and is the originator of the movement to honor Leif Erikson with a holiday in the United States.