Complex sentence: During his career he published 167 papers, usually as the sole author, and 12 textbooks, most importantly "The Ancient Life History of the Earth" which was published in 1898 and was re-published by eminent paleontologist Stephen Jay Gould in 1980.
Split into simpler sentences: During his career he published 167 papers, usually as the sole author, and 12 textbooks. A revised version of Professor Nicholson's work "The Ancient Life History of the Earth" was re-published by eminent paleontologist Stephen Jay Gould in 1980.