original = {{{{36 - 72 m^2}, {-36}, {9 + 8 m^2}}, {{4 - 2 e m - 9 m^2 + 3 d m^2}, {-4 + e m + d m^2}, {1 + m^2}}}, {{{-40, 32 m, 9 + 8 m^2}}, {{-5 + 5 d, e + 4 m + d m, 1 + m^2}}}}; Map[Flatten, original, {2}]
Great method, it utilizes level operations—thank you very much!
This method is great, thank you very much!
This flattens levels 3 and 4:
Flatten[original, {{1}, {2}, {3, 4}}]
