Complex sentence: In the case of the Space Shuttle the costs of space launches appear to be mostly composed of the operational costs of the people involved (as opposed to fuel or equipment), reducing these costs appears to be the best way to lower the overall launch costs.
Split into simpler sentences: In the case of the Space Shuttle the costs of space launches appear to be mostly composed of the operational costs of the people involved, as opposed to fuel or equipment. Reducing these costs appears to be the best way to lower the overall launch costs.