Complex sentence: Re-parenting can also be used to allow the contents of one window to be added to another; for example, a flash player application can be re-parented to a browser window, and can appear to the user as supposedly being part of that program.
Split into simpler sentences: Re-parenting can also be used to add the contents of one window to another. For example, a flash player application can be re-parented to a browser window, and can appear to the user as supposedly being part of that program.