During his time as the foreign minister of Belgium, Pierre Harmel, as he was a strong advocate of forward-looking diplomatic policy, pleased many of his most enthusiastic allies in his proposal that collective defense should be acknowledged as the foundation of world stability.

(A)as he was a strong proponent of forward-looking diplomatic policy, pleased many of his most enthusiastic allies in his proposal that collective defense should be

(B)as he was a strong proponent for forward-looking diplomatic policy, pleased many of his most enthusiastic allies by his proposal of collective defense being

(C)in being a strong proponent for forward-looking diplomatic policy, pleased many of his most enthusiastic allies with the proposal that collective defense being

(D)a strong proponent of forward-looking diplomatic policy, pleased many of his most enthusiastic allies by proposing that collective defense be

(E)a strong proponent of forward-looking diplomatic policy, he pleased many of his most enthusiastic allies in proposing that collective defense should be

my doubt :though i can eliminate A for various other reasons such as "that collective defense should be", i feel that usage of "as he was a strong proponent of forward-looking diplomatic policy, pleased many of his most enthusiastic allies.." is some how wrong. I believe that the construction is "as X ,Y ",where both X and Y are clauses in A in the construction of comma + Y the subject "Pierre Harmel" is left behind .is such a breakage of construction allowed as is done in A ?