Complex sentence: After anywhere between 30 seconds and 15 minutes the Shake Weight tires out and squirts a liquid from its top over the users face to signal that has the effect of cooling down the user and signalling the end of the workout.
Split into simpler sentences: After anywhere between 30 seconds and 15 minutes the Shake Weight tires out and squirts a liquid from its top over the users face. This has the dual effect of cooling down the user and signalling the end of the workout.