Simplify the following text for a Grade 10 native English-speaking person.
Original: McGhee started his career at Greenock Morton in 1975 and spent spells at clubs including Newcastle United , Aberdeen , Hamburg , Celtic , IK Brage and Reading .
Simplified: McGhee played for many Scottish and English clubs , before he had to retire because of injury . He started his playing career at Greenock Morton before moving on to Newcastle United , Aberdeen , Hamburg , Celtic , IK Brage and Reading and won the Scottish PFA Players ' Player of the Year in 1982 as well as four caps and two goals for the Scotland national football team .