The main purpose of this period of the year, when the company intensifies training for its employees, is (how) to acquire better performance at every level.
My question is: Would the use of how make this sentence incorrect? I find this structure in other languages (with "how"), but when I translate into English, I hesitate to put "how" in for some reason. If it is incorrect, could someone explain why?
The question is not limited to this particular example which may not be the best.