Complex sentence: Rainfall quantity received varies with altitude averaging to about 1067.5mm annually and ranging from 640mm in some areas to as high as 1,495mm per annum.On the higher attitude (above 1700m), the pattern changes to tri-modal.
Split into simpler sentences: Rainfall quantity received varies with altitude averaging to about 1067.5mm annually and ranging from 640mm in some areas to as high as 1,495mm per annum. At higher altitudes, (above 1700m), the pattern changes to tri-modal.