Are these sentences grammatically correct?

Question

1) Very often he behaves well.

2) He very often behaves well.

Thanks for your help in advance.

Answer 1

While "Very often he behaves well" and "He very often behaves well" are both grammatically correct, they should be more appropriate as: "He behaves well very often".

Answer 2

Yes. Both seem fine as written.

Answer 3

The second one should be:

He behaves well very often. 

You cannot split the noun and the verb like that.