The double-dealing ambassador fell under suspicion as much due to his mix of legerdemain land backpedaling in accomplishing his ends as to a distinctly unflattering comparison with the ostensibly straightforwardness of his Australian counterpart.
Consider a simpler example. eg His success was as much due to his good looks as to his intelligence. This means that two things were equally responsible for his success.
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Consider a simpler example.
eg His success was as much due to his good looks as to his intelligence.
This means that two things were equally responsible for his success.
1) his good looks
2) his intelligence
Now let's consider your sentence.
The double-dealing ambassador fell under suspicion
as much due to his mix of legerdem