Complex sentence: Born in Jamaica, she emigrated at eight years old to Great Britain where she gained three AAA titles as a junior in the 100 yds and 150 yds in the under 15s category in 1967 and won the 220 yd in the under 17 category in 1968.
Split into simpler sentences: Born in Jamaica, she emigrated at eight years old to Great Britain. Marilyn gained three AAA titles as a junior in the 100 yds and 150 yds in the under 15s category in 1967 and won the 220 yds in the under 17 category in 1968.