Complex sentence: Until 2004 an earthen ramp allowed non-Muslim visitors direct access to the Temple Mount through the Mughrabi-Gate, during the winter of that year heavy (by Israeli standards) snowfall caused the ramp to collapse.
Split into simpler sentences: Until 2004 an earthen ramp allowed non-Muslim visitors direct access to the Temple Mount through the Mughrabi-Gate. During the winter of that year heavy snowfall (by Israeli standards) caused the ramp to collapse.