Moving an Amazon Sword

I have a problem...my Amazon sword has taken over my tank.
I would appretiate any advice on proper procedure for moving,
pruning and splitting (?) of this plant.

The problem all started when I was sold what I was told was a species
of dwarf Sagittaria...great foreground plant right, WRONG.  Instead
of staying with nice two inch long petioles, the leaves just kept getting
begger and bigger where now they are over a foot long (in a 29 gallon!).

Thanks in advance for all suggestions.

dswanson at banyan_pfc.forestry.ca