Complex sentence: He graduated in 1869 at the Michigan Agricultural College, studied at Harvard under Prof. Asa Gray, in 1872 and in 1875-76, and was professor of botany at the Iowa Agricultural College from 1870 to 1884.
Split into simpler sentences: He graduated in 1869 at the Michigan Agricultural College, studied at Harvard under Asa Gray, in 1872 and in 1875-76. He was professor of botany at the Iowa Agricultural College from 1870 to 1884.