Complex sentence: In Mac OS X Tiger the Quartz Debug program includes a feature which allows the user to scale the interface, however the feature is incomplete, as some icons will not show (such as in System Preferences) and certain bitmap GUI elements are not scaled smoothly.
Split into simpler sentences: In Mac OS X Tiger the Quartz Debug program includes a feature which allows the user to scale the interface. However, the feature is incomplete, as some icons will not show (such as in System Preferences) and certain bitmap GUI elements are not scaled smoothly.