Complex sentence: Another well known number theorist Louis Mordell joined the Manchester College of Science and Technology (later to become UMIST) in 1920 then went on to become Fielden Reader in Pure Mathematics at VUM in 1922 and then Fielden Chair in 1923.
Split into simpler sentences: Another well known number theorist Louis Mordell joined the Manchester College of Science and Technology (later to become UMIST) in 1920. Mordell then went on to become Fielden Reader in Pure Mathematics at VUM in 1922 and then Fielden Chair in 1923.