He completed his primary and secondary education at Bussere Elementary School in Wau and Kampala Senior Technical.
[4] After receiving the advanced diploma, Tombura returned to Sudan and worked as a teacher in various schools in the northern region for 21 years.
In 1976, he was appointed as the director general of the regional Ministry of Cooperatives and Rural Water for two years.
Likewise, Joseph Lagu appointed Tombura as the Regional Minister of Public Works from 1978 to 1980.
In 1982, he replaced Gismalla Abdalla Rassas as the President of the High Executive Council of the Southern Sudan Autonomous Region.