What am I doing wrong?

AND(
{Order Complete?} =FALSE(),
{Doc Type} ="O",
{OELine Qty Backordered} >0,
{Cust #} ="TD5775",
OR(
{OEHead Salesperson} ="KINGSN"
))

I don't really know how to use AND and OR together, but what I'm trying to accomplish is:

Show me all incomplete orders with items on back order for customer TD5775 and all other customers if their salesperson is KINGSN.

Can anyone help?