Complex sentence: The central to western part of Sicily is made of the Maghrebian-Apenninic orogen which represents the fold and thrust belt of the subduction system, which a combination of frontal accretion and low-angle detachments formed the present geological structure.
Split into simpler sentences: The central to western part of Sicily is made of the Maghrebian-Apenninic orogen which represents the fold and thrust belt of the subduction system. A combination of frontal accretion and low-angle detachments formed the present geological structure.