I simply don't understand how Two-Weapon Fighting, Two-Weapon Wielder, and Ambidextrous are supposed to work in conjunction. Two-Weapon fighting looks like the writer went to take a pee in the middle and forgot where he/she left off, seems both redundant and contradictory of itself, and in a few places just plain incorrect. Then, it keeps referring to Two-Weapon Wielder, which tries to help, but again, seems to contradict T-W Fighting. Sudden;y, Ambidextrous is the savior (almost, by negating all penalties to the secondary hand (?),after which all penalties apply as normal?
Someone, please, start from the beginning and explain this mess. Use example. Draw diagrams. I've been looking at this for over four hours and it's a complete clusterfeth to me.