Answer: You can shorten the vine by cutting it just above a leaf. (Cut a little above the leaf stem, do not damage it.) If you want to start more plants, use tip cuttings. Here are directions (with illustrations/photos) on how to do that. You may need to cut and paste the complete url into your browser to make it work correctly.
You can encourage the plant to grow denser and branch by pinching out the growth tip from time to time, or by cutting off the tip (you can root it for a new plant if you want to. Enjoy your philodendron!
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