Complex sentence: Her first high profile comedy role was in "Drop the Dead Donkey" in 1990, and she went on to star in "Peak Practice" and first appeared at the start of Series 7 (Episode 1) in 1999 and played Dr Joanna Graham.
Split into simpler sentences: Her first high profile comedy role was in "Drop the Dead Donkey" in 1990. She went on to star in "Peak Practice", first appearing at the start of Series 7 (Episode 1) in 1999 as Dr Joanna Graham.