The phrase "a massive effort by" is correct and usable in written English.
It can be used to describe a significant amount of work or resources contributed by a person or group towards a particular goal or project.
Example: "The success of the event was due to a massive effort by the volunteers who dedicated their time and energy."
Alternatives: "a tremendous undertaking by" or "a significant contribution from".
They got me back in nine days, which was a massive effort by the rehab team.
It takes a massive effort by teachers to get them here, but from what I saw, it's well worth it: the room buzzed with excitement and possibilities.
Despite a massive effort by international NGOs and the governments in Lebanon and Jordan to support the children and provide them with education, more youngsters are out of school than in it.
The day before her violent abduction, Farooqi took part in a polio campaign, part of a massive effort by the government of Khyber Pakhtunkhwa province to stamp out the crippling disease.
But it will take a massive effort by ordinary citizens to call their Senators with a litany of demands: a prohibition on all forms of bulks surveillance, no more secret law and a privacy advocate in the secret Fisa court.
The site's members took part in a massive effort by the Halo community to raise money, primarily through selling collectible items through eBay auctions.
And that was before there was any massive effort by the Israeli government to colonise the West Bank in order to confiscate it.
Two straightforward penalties sandwiched a massive effort from fully 54 metres by Scott Spedding, the full back finding the target from way out on the left and a yard inside his own half.
Over the past two months, a massive effort has sought to repair the damage caused by the storm – especially in the Irrawaddy Delta, where it hit hardest.
We are currently involved in a massive effort to immunize children against measles in the three countries affected by Ebola.
Citizen science projects represent a massive effort spent on biodiversity monitoring that could not otherwise be covered by the professional community alone without huge sustained financial investment.
