Care of Crown of Thorns

A friend of mine recently gave me a Crown of Thorns plant he had for many years. This is the first time I have ever seen one so I'm not sure what they are supposed to look like. This plant is tall and has several very long stems sticking out. Is there a way to replant this or to cut and root any of the stems to make the plant fuller?  Can you please share any tips on care?

Succulents and cacti like the crown of thorns have to be appreciated for their form and texture as opposed to the lush foliage of our tropical indoor plants. Grow your crown of thorns in a sunny window. Keep it in a cool room for the winter and water thoroughly but only when the soil dries. As the days lengthen and the light intensity increases you will need to water more often. At this time leaves should appear. It is common for this plant to drop the leaves during the winter and replace them during the sunnier times.

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