[1] A member of the Bassar ethnic group in central Togo, he attended a missionary school as his early education.

After years of doing engineering work without qualifications, such as designing expressway structures, he enrolled at the École nationale supérieure des mines de Nancy in 1977 and graduated in 1981.

[2] This initiative won Yamgnane the "National Award of citizenship" in April 1990, and he was named "Breton of the year" by Armor Magazine.

Yamagnane served on several commissions in the Assembly, including national defense, trade, cultural affairs, finance, constitutional laws, marine transport safety, and children's rights.

Yamgnane campaigned on improving the health of Togolese, fixing roads and bridges, reducing unemployment, and curbing corruption.

[6] He was arrested in October 2014 on the charge of "influence peddling" and tax evasion in the context of the Christophe Rocancourt case.

[2][4] He is friends with Togolese archbishop Denis Amouzou, as the two share an affinity for scouting.