Complex sentence: After graduating, she worked as a teacher for several years, working at Rothesay Academy, Isle of Bute from 1979 to 1982, at Springburn Academy in Glasgow between 1982 and 1989, and at Castlemilk High School, also in Glasgow, from 1990 to 1999.
Split into simpler sentences: After graduating, she worked as a teacher for several years, joining the faculty of Rothesay Academy, Isle of Bute in 1979. From 1982 to 1989 she taught at Springburn Academy in Glasgow, then worked at Castlemilk High School, also in Glasgow, from 1990 to 1999.