The phrase "allow it to extend" is correct and usable in written English.
You can use it when discussing the permission or capability for something to be prolonged or lengthened in time or space.
Example: "We need to allow it to extend beyond the initial deadline to accommodate all participants."
Alternatives: "permit it to continue" or "let it be prolonged".
Although the combined entities' cheaper prices could dampen Instinet's market share, Instinet has made strategic acquisitions that allow it to extend its institutional customer base, where its captures greater revenue per share.
A Foodpanda spokesman said that the acquisitions will allow it to extend its leadership in India and Mexico, while concentrating on its core markets in Southeast Asia, Russia, and Brazil.
In June 2008, Nokia acquired social activity service Plazes, saying the "visionary team" and "key assets" would allow it to extend its context-based services.
The rings serve as a backbone for the Network Plus' service, and allow it to extend its DSL service to outlying suburban areas in those regions.
"The complaint alleges that there also is a dangerous probability that Intel's unfair methods of competition could allow it to extend its monopoly into the GPU chip markets".
Taking on OptiSolar's power plant projects–and, significantly, its plant development team sets First Solar up to move to an integrated model that will allow it to extend its already industry leading price advantage.
Like other manufacturers, BMW hopes that its platform allows it to extend its relationship with those customers beyond the showroom.
Many argue that Iran grew stronger as a result of the war, allowing it to extend its influence to Iraq, where the Shiites, not the Sunnis, now dominate political life.
"The show allows it to extend its audience beyond little girls to teen girls and adults who are not playing with Barbies anymore but have an emotional tie with the brand and may be collectors".
Civil war in neighbouring Lebanon in the 1970s allowed it to extend its political and military influence in that country.
But the new credit facility allows it to extend its loan from the 15 banks, whose lead underwriter is Barclays, by 2.5 billion euros ($3.4 billion), to 12.5 billion euros ($17.0 billion).
