Keeping my fragil Geranium a live

Hi
I have managed to keep a South African Geranium a live moving here. It was left by chance inside a pot. It has exquisite small wine colored flowers. Over the past 5 years I keep it in the garden in summer and indoors in the winter. Is had grown long rather not so pretty long dry stems and only green leaves at the ends.
How can I get rid of the center branches and re plant the healthy green ones in the center of the pot? I'd like to make it into a more fuller looking plant with the healthy stems starting from the center and not hanging over the edge. My cats love to much playing with these hanging stems where ever I put them.
How can I cut and re root etc I want to make SURE not to kill it as it has been through so much and I love the look in autumn when it blooms. Thanks a lot.

 

What it needs is more light.

 

it is 2m meters away facing south a 4m x 1.5m living room window
if I put it down at cat level they kill the branches in winter
in winter sun is very low and it get FULL light from the south facing window
Thanks

 

Be that as it may, specimen is clearly in need of much more light. Pels grow outdoors in full sun in places like California.

 

Ok thank you. It has flowered every 5 past years since. That does not answer my question on how to make it a more "centralized" plant in a bigger pot? I don't want the overhanging dry look. Must I cut and re root or simply bury it all in a bigger pot and only let the green bits stick out? These are the question I am looking to have answered. The plant spends each summer in the garden in a full south sun position. This is Vancouver I can't create more sunshine than we have. Thanks

 

I don't usually grow Pelargoniums, but when I did I trimmed them back in the fall and kept water to a minimum and put them in a cool location to induce a sort of dormancy, then gradually brought them back to life in the spring. Othwise, I would still trim in fall and put them under artificial light to keep it as a house plant in winter.

RHS offers this page, which has over wintering options.
http://apps.rhs.org.uk/advicesearch/Profile.aspx?pid=338