"ensure its completion" is a correct and usable phrase in written English.
It is typically used to express the action of making sure that something is finished or fully accomplished. It can be used in any situation where there is a goal or task that needs to be completed. Example: The project manager was responsible for ensuring the completion of the project on time and within budget.
Mr. Giuliani defended the additional cost, saying it was necessary to ensure its completion by opening day next June.
Although Horton retired last year, he has stayed involved with the Stanford Perimeter Trail project to ensure its completion.
And the team has initiated a campaign on Kickstarter for supporters to help fund the project and ensure its completion.
I've never had a great record with such decisions before, but this year should be different, because the nature of the resolution itself will ensure its completion.
Of course, by the time the project comes to fruition, Paterson herself almost certainly won't be alive to ensure its completion, but she seems unfazed by the inevitable letting go.
The editors of the local newspaper, The Western Star, encouraged citizens to support the project, but by taking a more active role and organizing a locally-owned railroad company to ensure its completion.
This would isolate the News Corp/BSkyB transaction from any UK newspaper consideration, thereby ensuring its completion.
The Bill and Melinda Gates Foundation funds the Emory University/Maternal and Newborn Health in Ethiopia Partnership (MaNHEP) which has sponsored the study and provided significant administrative and logistical support that ensured its successful completion.
Ms. Hepburn not only developed the building herself — adding details like a scattering of Greek letters on the building's base, and hiring the renowned sculptor Rene Paul Chambellan to add ornamental Art Deco-style carvings — but also ensured that upon its completion, the trustees who ran it would all be women, Ms. Scutts said.
