Complex sentence: A number of solar panels may also be mounted vertically above each other in a tower, if the zenith distance of the Sun is greater than zero, and the tower can by turned horizontically as a whole and each panels additionally around a horizontical axis.
Split into simpler sentences: A number of solar panels may also be mounted vertically above each other in a tower, if the zenith distance of the Sun is greater than zero. If the tower can by turned horizontically as a whole and each panels additionally around a horizontical axis.