On to the next chapter...

This is a model sentence for one exercise, I need to substitute different elements in it:
Борис пожаловался на то, что ему скучно. Does this mean, "Boris complained about being bored/that he was bored."? What does the на то add to the sentence? I haven't run across this before and I don't see it explained in the book.

Also there is the verb болеть on the vocabulary list. Is this pronounced the same as балет except for the soft final t?

Thanks,
Z