Complex sentence: The High Line is a 1.5-mile-long stretch of abandoned railroad viaduct that runs from the Meatpacking district to Hell's Kitchen and the proposed design by Field Operations is meant to transform it into a 1.5-mile-long park.
Split into simpler sentences: The High Line is a 1.5-mile-long stretch of abandoned railroad viaduct that runs from the Meatpacking district to Hell's Kitchen. The proposed design by Field Operations is meant to transform it into a 1.5-mile-long park.