Complex sentence: The scientific evidence clearly indicates that this is not the case... measurements of atmospheric temperatures made by instruments lofted in satellites and balloons "show that no warming has occurred in the atmosphere in the last 50 years".
Split into simpler sentences: The scientific evidence clearly indicates that this is not the case. However, measurements of atmospheric temperatures made by instruments lofted in satellites and balloons "show that no warming has occurred in the atmosphere in the last 50 years".