Complex sentence: In the 1950s, it became more widely available after some local cheese factories began producing it and it can be a useful way of using up the "ritagli" ("scraps " or"rags") of mozzarella.
Split into simpler sentences: In the 1950s, it became more widely available after some local cheese factories began producing it. The factories are generally believed to have found making it to be a useful way to use up the "ritagli" ("scraps " or"rags") of mozzarella.