Complex sentence: Since then, the company has been virtually unbroken, moving from the first store in Milan, which was launched in 1964, to becoming an international brand, which looks for a further expansion of markets undergoing great expansion, such as China.
Split into simpler sentences: Since then, the company has been virtually unbroken, moving from the first store in Milan, which was launched in 1964, to becoming an international brand. As an international brand it looks for a further expansion of markets undergoing great expansion, such as China.