Complex sentence: He has developed a reputation for fussing over details and panicking about suspect cars following the bullion van, but behind this all he has hatched the'perfect' plot to steal a load of bullion and retire.
Split into simpler sentences: He has developed a reputation for fussing over details and panicking about suspect cars following the bullion van. He appears to be a man dedicated to his job and security, but in fact he has hatched the'perfect' plot to steal a load of bullion and retire.