Complex sentence: Frank Rosebrook Millspaugh (born April 12,1848 in Nichols, New York), was an alumnus of Shattuck School, now Shattuck-Saint Mary's, Faribault, Minnesota.
Split into simpler sentences: Frank Rosebrook Millspaugh was born on April 12,1848 in Nichols, New York. He was an alumnus of Shattuck School, now Shattuck-Saint Mary's, Faribault, Minnesota.