Complex sentence: In the summer of 1898 he joined the faculty at the University of Oregon as an Assistant Professor of Latin; he became full professor, at age 26, in 1898 upon the death of senior faculty member, Prof. John Wesley Johnson.
Split into simpler sentences: In the summer of 1898 he joined the faculty at the University of Oregon as an Assistant Professor of Latin. He became a full professor, at age 26, in 1898 upon the death of the senior faculty member, Prof. John Wesley Johnson.