The part of the sentence "has been frequently compared" is correct and usable in written English.
It can be used in a sentence to indicate that something has been compared or likened to something else on multiple occasions. For example: "The vampire bat, which feeds on the blood of other animals, has been frequently compared to the vampire of legend."
Harbach's writing has been frequently compared to Franzen's, and shares an intelligent, unaffected directness.
Her verse has been frequently compared to that of the English Metaphysical poets in its restrained, intellectual style, its compressed diction and imagery, and its formal concerns.
"Maron" has been frequently compared to FX's "Louie," and the two comedians are longtime friends, though their relationship has been rocky over the years.
The instrument's sound has been frequently compared with the Wurlitzer electric piano, which used a similar technology, but with the hammers striking metal bars instead of tines.
The game's dark and supernatural yet cartoonish art style was influenced by the work of filmmaker Tim Burton, to which it has been frequently compared, and by writers Edward Gorey and H.P. Lovecraft.
The success of the film alone has helped propel Hollywood mainstream toward more graphic displays of previously censored themes, a similar case to Psycho (1960), to which Blue Velvet has been frequently compared.
You've been frequently compared to Steve Grand ("All-American Boy"), who is similarly open about his sexuality and has used social media to promote his music.
In the meantime, it is not lost on those rioters that the deep financial crisis that has cast both the US and the UK into huge budget deficits was caused by behavior which has been frequently and obviously compared to looting.
This design of the trial did not allow for controlling for a potential placebo effect; thus, the effectiveness of the treatment could have been overestimated, as it has been frequently observed when comparing non-controlled and controlled trials [ 31].
In many articles, device performances based on new dyes being tested are compared with what has been frequently referred to as a benchmark/reference dye which is typically a Ruthenium dye commonly known as N719.
At least one of them even targeted a major sporting event, setting off a bomb at the 1996 Atlanta Olympics that killed one person and injured 111 others – an attack that has now been frequently compared with the Boston Marathon bombing.
