Complex table

Hi all,

One of the problems I have in implementing accessibility is complex data
table. Take the example from the attached graphic. The table is
basically the HTML version of a form. 
Now, how do I make this type of table accessible? Should I put all rows
into one table or should I break each chunk of rows as separate table?
How do I put the th element and how does the relationship between th and
other th elements in different row and between th and td elements?

I really appreciate your input/feedback on this.

Thanks and regards,
Budy Harnata