Complex sentence: In 1924 Underwood commenced a cadetship with the Department of Agriculture and studied Agriculture at the University of Western Australia gained his bachelor of science in 1928, graduating with honours his thesis "a botanical and chemical study of Western Australian pastures" was published in 1929.
Split into simpler sentences: In 1924 Underwood commenced a cadetship with the Department of Agriculture and studied Agriculture at the University of Western Australia, gaining his bachelor of science in 1928, which he graduated with honours. His thesis, "A botanical and chemical study of Western Australian pastures", was published in 1929.