Complex sentence: The breed is also known for the length of its fertility and strong maternal instincts, with the Guinness Book of Records listing a Large Black sow as having produced 26 litters between 1940 and 1952-the largest number of litters ever recorded in a pig.
Split into simpler sentences: The breed is also known for the length of its fertility and strong maternal instincts. The "Guinness Book of Records" listing a Large Black sow as having produced 26 litters between 1940 and 1952-the largest number of litters ever recorded in a pig.