Complex sentence: In November, 1883, Garnett was appointed Principal and Professor of Mathematics in the Durham College of Science, Newcastle-upon Tyne, and began that post the following year; he also assisted in planning and erecting the buildings of Durham College of Science.
Split into simpler sentences: In November, 1883, Garnett was appointed Principal and Professor of Mathematics in the Durham College of Science, Newcastle-upon Tyne, and began that post the following year. He assisted in planning and erecting the buildings of Durham College of Science.