Complex sentence: In 1892, he was the first Principal of Reading University Extension College, which later became the University of Reading, and in 1893 was one of the founders of the Geographical Association, which promoted (and promotes) the teaching of geography in schools.
Split into simpler sentences: In 1892, he was the first Principal of University Extension College, Reading, which later became the University of Reading. The following year, he was one of the founders of the Geographical Association, which promoted (and promotes) the teaching of geography in schools.