Complex sentence: Genoese invented and created the cloth then called "Blue Jean", from which derives the modern name of jeans, used by sailors for work and to cover and protect their goods on the docks from the weather.
Split into simpler sentences: Genoese invented and created the cloth than called "Blue Jean", from which will be named the modern Jeans. The sailors used this cloth for work and to cover and protect their goods on the docks from the weather.