The phrase "an effort which is" is correct and usable in written English.
It can be used to describe a specific type of effort or to elaborate on the nature of the effort being discussed.
Example: "The project requires an effort which is both collaborative and innovative to achieve success."
Alternatives: "an endeavor that is" or "an attempt that is".
It is an effort which is very different from the previous [bond-buying programme].
That's being interpreted as an olive branch as the BHA now tries to improve its relationship with racing professionals, an effort which is proving as necessary as I predicted in this space two months ago.
This production, which was adapted from Paul Armstrong's play "The Heart of a Thief," comes to the screen as "Paths to Paradise". Whether the scenario writer or the director have adhered to the playwright's version matters little, as these experts have succeeded in putting forth an effort which is continuously amusing.
The optimization of production from a field is the pursuit of production strategies that are more economically attractive, an effort which is usually based on reservoir simulation.
This study also extends progress toward a comprehensive DNA barcode reference library for the biota of the Churchill region [ 2- 10, 23], an effort which is creating new opportunities for ecological research and monitoring programs.
The use of an efficient recombinant expression system will greatly facilitate production processes of individual isoenzymes, which can then be evaluated for their suitability for any given application, an effort which is highly recommendable, regarding the diversity of the biochemical properties of the different isoenzymes.
In 1844, Joseph Smith rejected the platforms of the major candidates for President of the United States and decided to conduct his own third-party campaign for the Presidency —an effort which was cut short by his death on June 27 of that year.
Moments later the Scotland attacker drove wide from 25 yards with an effort which was as unconvincing as the visitors' play.
Stephen Foster was particularly unlucky not to put them ahead, first with an effort which was foiled by the keeper, Keiren Westwood, and then with a header which hit the woodwork.
United continued to surge forward and Rooney was unlucky with a sweetly struck free-kick which crashed back off the woodwork before Van Persie had an effort which was correctly ruled offside.
He superbly turned Tam Scobbie as a high ball was played up to him but after setting himself up for the shot on his left foot he could only deliver an effort which was more akin to a pass-back.
