"Extensive promotion" is a correct and usable phrase in written English.
It is typically used to refer to an event or product that has been heavily advertised or has otherwise received substantial attention. For example, you could say: "The new product launch was a huge success, thanks to the extensive promotion it received."
Extensive promotion: Our events receive targeted marketing across theguardian.com – reaching over 131m unique visitors per month – as well as advertising in our print newspapers.
The documentary, long by sports standards, must now fulfill the promise of its extensive promotion.
The Dutch finance extensive promotion of their bulbs to support their market.
Like Wahlberg, Gere travelled to the UK for extensive promotion, and new UK distributor Koch supported with visible marketing.
And the houses for "A Quiet Place," while not terrible, were also disappointing, despite strong reviews and extensive promotion.
"Smash" has seen its ratings fall slowly but steadily since its encouraging start after an extensive promotion campaign by NBC.
But even as Mr. Springsteen's camp plans extensive promotions, from premieres of different songs on America Online to a live appearance on "Today" from Asbury Park, N.J., few people outside his inner circle have heard the album.
Despite their pledges to cut back on discounting, both M&S and Debenhams are running extensive promotions, while hardly a rail of bargains can be found in Next, Zara, Ted Baker, Jigsaw, Fat Face or JD Sports.
Fox's concern then turned to extensive promotions for an upcoming series, "The Following," which deals with a police officer's hunt of a ruthless serial killer who recruits an army of followers.
Lopez then confers, in the chapter "Press Tours / Promotions", about the extensive promotional schedule she was on to promote the album.
In 2007, the Workshop participated in an extensive health promotion in Mexico; they put many of the characters of Plaza Sésamo on milk containers, which were given to schools, with positive messages about nutrition and exercise.
