 Rambai muchinyora ndima ino - Mune imwe yemitambo yake yekutanga yepasi rose, akaisa wechina mu1999 All-Africa Games. Akanga ari mukwikwidzi wechidiki pa1999 African Junior Athletics Championships, asi akakundikana kupedzisa mumutambo uyu pa2000 World Junior Championships muAthletics. Akasarudzwa nokuda kweheptathlon pa 2001 World Championships muAthletics uye akaiswa 13th zvachose. Kubudirira kwevakuru kwakauya gore rakatevera apo akatora menduru yebronze pa2002 Commonwealth Games uye akazohwina menduru yegoridhe yeheptathlon pa2002 African Championships muAthletics. Akakundikana kupedzisa mu2003 World Championships muAthletics. Muna 2004, Simpson akava African Champion kechipiri uye akatevera mhedzisiro iyi nenzvimbo yechipfumbamwe kumaOlympics eAthens muna 2004. 