Lankiness is usually a result of low light. So give it the strongest light you can (but don't move it suddenly from shade to full sun, it needs to adjust slowly). You could always cut off that main stem (use it as a cutting to get another plant). That should give you a number of new shoots if there's plenty of good light.

It has had full direct light on the lady's sun porch for the past 5yrs. I just moved it inside from being outside all summer and it is in front of a very large window. If I cut it back with the old stalk produce new shoots? Where should I cut.

The old stalk will reshoot but what I've found is that new shoots that get too shaded usually end up withering. You could cut yours just above the small branch near the bottom or even higher. Looking at the photos I still think your plant was in low light. It's a small healthy plant but the leaves are large and the petioles long.

Many discussion about this on house plant forum. I might wait until late spring to do any surgery.

Just leave it..took years to get character. Enjoy!