Complex sentence: Hudson Yards officially broke ground on December 4,2012 with the first tower, an 895-foot-tall office building in the southeast corner of the site, expected to be complete in 2015.
Split into simpler sentences: Hudson Yards officially broke ground on December 4,2012. The first tower, an 895-foot-tall office building in the southeast corner of the site is expected to be complete in 2015.