Since no one in Denmark could answer who A A Kranhold was and as mentioned why he had thrown himself into the early Danish stamps I had to expand my search as it was no good to search the Danish philatelic journals

Could you correct the punctuation please?
Since no one in Denmark could answer who A. A. Kranhold was, and - as mentioned - why he had thrown himself into the early Danish stamps, I had to expand my search as it was no good to search the Danish philatelic journals.