Complex sentence: Unlike polysomnography, actigraphy allows the patient to be movable and to continue her or his normal routines while the required data is being recorded in his or her natural sleep environment; this may render the measured data more generally applicable.
Split into simpler sentences: Unlike polysomnography, actigraphy allows the patient to be movable and to continue her or his normal routines while the required data is being recorded. The patient may stay in his or her natural sleep environment and this may render the measured data more generally applicable.