"The main reason for this is the traditional Chinese way of teaching English language tends to stress the importance of grammar and reading practice, but attention paid to speaking probably was even less than a half of that of reading, subsequently, speaking has been becoming more trivial every year since the 80s."
This is the original sentence I wrote, I am not sure about two parts, 1: but attention paid to speaking probably was even less than the half of that of reading. should I use a, nothing or the here?
2: speaking has been becoming is it fine to use has been becoming here?
please help with this bit of my essay!