The phrase "a major changing" is not correct in written English.
It is incorrect because "changing" is a gerund and does not fit well with the article "a" in this context.
Example: "The company is undergoing a major change in its management structure."
Alternatives: "a major shift" or "a significant transformation."
End with Bilbo's choosing to go on an adventure (because this is a major changing point for the character).
In November when ITV finally bought out the last remaining GMTV minority shareholder, Disney, and took editorial control, it was clear there would be a major changing of the guard, on and off screen.
"It really is a major changing of the guard, and this is the end of the Kennedy dynasty," Darrell M. West, a Brookings Institute scholar and author of "Patrick Kennedy: The Rise to Power".
The departures next year of Senators Tom Harkin of Iowa, Frank R. Lautenberg of New Jersey, John D. Rockefeller IV of West Virginia and Carl Levin of Michigan will result in a major changing of the guard in a body once known for stability and longevity.
A major changing of the guard was also initiated this year when longtime City Manager Jim Starbird announced his retirement.
Those who have begun to express a gender different from the one assigned at birth are usually undergoing a major life changing event.
Prior to entering the treatment center, Sandie had something I call an "EpiphaME --a major lifEpiphaME --awakEpiphaME --a
Because a career change is a major life-changing event, an internship is as much about convincing yourself that it is the right thing to do as it is about obtaining the skills and lingo to convince employers to hire you.
These politically-motivated changes, they expounded, have played a major role in changing the organization's key strategic areas.
The public plays a major role in changing the social acceptance of the deadly behaviors of distracted driving, and I'm happy to hear that maybe we are changing some minds and people are putting down their phones while driving.
