A. winning prestigious awards in both France as well as Japan for his achievement at so young an age, and he is hoping
"both...and..." is the correct structure not "both...as well as..." also "he is hoping" implies that he is literally hoping to continue at this very particular moment, a better usage would be he hopes, implying a general attitude
B. winning prestigious awards both in France and Japan for his achievement at such a young age, and hoping
there is preposition within the structure "both in France and Japan" and correct usage would be "both in France and in Japan"
C. having won prestigious awards both in London and Tokyo for his achievement at so young an age, hoping
there is preposition within the structure "both in London and Tokyo" and correct usage would be "both in London and in Tokyo"
D. winning prestigious awards in both France and Japan for his achievement at such a young age, and he hopes
CorrectE. having won prestigious awards both in France as well as Japan for his achievement at so young an age, and he hopes
"both...and..." is the correct structure not "both...as well as...".Also there is preposition error again. In addition, I don't think there is any particular reason to use perfect participle "having won"