"become by" is not a proper part of a sentence in English.
You cannot use it in written English. For example, you could not write: "The answer became by quickly."
Football has become, by stealth, a symbol of modern Britain.
"When you leave the hospital, you become by default your own care coordinator," Dr. Coleman said.
The moment, she said, highlighted how frustrated she had become by religion.
WE don't know how much hotter the planet will become by 2100.
In June Afghanistan surpassed Vietnam to become, by some measures, the longest campaign in America's history.
He has become, by some measures, the strongest man in history.
By the middle of this week, I had become by default the central repository of information.
"It is not even about who a student has become by graduation.
Indeed, in the years to come, the educational system may become, by necessity, increasingly individualized.
Modern politics has also taught us how marginalised women can become by so-called sofa government.
