The phrase "arguably made a" is correct and usable in written English.
It can be used when discussing a claim or opinion that is open to debate or interpretation, often in the context of achievements or contributions.
Example: "He is arguably made a significant impact on the field of science with his groundbreaking research."
Alternatives: "possibly created a" or "potentially had a".
Both, arguably, made a robust effort to operate sustainably.
Stalin has arguably made a greater impact on the lives of more individuals than any other figure in history.
Miller's legal team arguably made a mistake by limiting her claim to £100,000 when she began legal action.
The second decision came in the signing of Nicolas Lodeiro - a move that has arguably made a bigger impact on the club.
Geithner arguably made a similar miscalculation himself last year as a top Federal Reserve official who was part of a team that allowed Lehman Brothers to fail.
Even the likes of Karl Pilkington, as funny as he is, has arguably made a living from this 'Ey up, I'm a bit thick me' image.
She has arguably made an equally big mark with her frequent speeches to women, which are a call to draw more women to technology, and to Facebook.
Instead, he covered 11 Olympic Games, from Rome in 1960 to Sydney 2000, and six football World Cups, arguably making a greater contribution to sport than he would have as a mere competitor.
That would arguably make a favorable response to the idea of lifting the ban — if that is what the scouts ultimately get — even more meaningful, while a response supporting the status quo could fairly be said to be the equivalent of an "amen" from the choir.
With a couple generators this place would arguably make a better backdrop to Coachella if it didn't close after dark.
Leading early didn't help the pattern against Ghana and trailing Portugal early (it was the sixth time the USA have conceded a goal in the first five minutes of a World Cup game) arguably made for a more decisive performance, but that would hardly be an advisable tactic against a rested Germany looking to counter.
