Original sentence: Tonight at 11:30 pm earned about a 1.3 to 1.5 rating in the 18-49 demographic, and earning a 1.7 to 2 at 10 pm—2 was the typical rating for NBC's dramas during the 2008-2009 season—would likely make Leno a success; according to Jeff Zucker, head of NBC Universal, a 1.8 rating for Leno would be a "home run
Edited sentence: Tonight at 11:30 pm earned about a 1.3 to 1.5 rating in the 18-49 demographic, and earning a 1.7 to 2 at 10 pm—2 was the typical rating for NBC's dramas during the 2008-2009 season, and 2.5 is generally necessary for a 10 pm drama to succeed —would likely make Leno a success; according to Jeff Zucker, head of NBC Universal, a 1.8 rating for Leno would be a "home run