Simplify the following text for a Grade 13 native English-speaking person.
Original: Following his university education he found employment with Aer Lingus , the state airline of Ireland , in 1947 and became an authority on the strategic economic planning of transport .
Simplified: Following his university education , in 1947 he started working with Aer Lingus , the state airline of Ireland , and became an authority on the strategic economic planning of transport .