Original sentence: Close went to the United States and, with the assistance of his brothers, started buying up land in Iowa: their first purchase was a tract of 14,475 acres bought at just $2.40 per acre
Edited sentence: Close went to the United States and, with the assistance of James and John, his brothers, started buying up land in Iowa: their first purchase was a tract of 14,475 acres bought at just $2.40 per acre