Whakakīhia te rerenga e whai ake nei: Ko Osoro i tohu i a Kenya e rua i runga i te atamira o te ao i te tau 1991, e rere ana i te
1991 IAAF World Cross Country Championships (kei reira ia i te tuarima i te whakataetae roa) ka haere ki te ara i te 1991 World Championships i roto i te Athletics (i whakakorea i roto i te 5000 mita wera e te tawhiti iti ki a Dionísio Castro). Heoi, i wini ia i tetahi mētara i te 5000 m i nga Taakaro o Awherika katoa i taua tau 1991. I whakaatuhia e ia i roto i te kapa Cross Country o te Ao o Kenya mo te wa tuarua i te 1992 IAAF World Cross Country Championships, ahakoa he iti ake te angitu i tenei ngana i te mea i mutu ia i te 23 o nga waahi. I roto i ana haerenga i runga i te ara, i toa ia i te Belfast International Cross Country meet.