Complex sentence: Clothing manufacturer Levi Strauss & Co. introduced low-rise jeans in December 2000, the top of which were about below the navel, with a zipper of a mere long.
Split into simpler sentences: Clothing manufacturer Levi Strauss & Co. introduced low-rise jeans in December 2000. These jeans were designed to top out at about below the navel, with a zipper of a mere long.