Court dismissed the plea filed by the victim.
Above is the original sentence read by me in news paper
Can I write the sentence as below,
Court dismissed the plea (which was) filed by the victim.
Yes. The original form
Court dismissed the plea filed by the victim.
is a "reduced relative clause", which you have expanded as
Court dismissed the plea which was filed by the victim.
This reduction is explained at
Thoughtco "reduced clause"
"Reduce to an Adjective Phrase"
answered May 16 at 19:10
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1This is a common practice in print reporting; it is also anecdotally fairly common in speech in some areas. – Jeff Zeitlin May 16 at 20:13
"Court dismissed the plea which was filed by the victim."
Here,"which was filed by the victim" is a relative clause modifying its antecedent "the plea" in the main clause.
You can omit the part "which was" to form a reduced relative clause :
"Court dismissed the plea filed by the victim."
Here, the adjective phrase, "filed by the victim", serves as the postmodifier of the NP "the plea".
Therefore, both sentences are correct. The postmodifier of the NP (the plea) is a finte clause in one sentence and a phrase or a non-finite clause in another sentence.
In modern grammar, the adjective phrase "filed by the victim" is treated as the Past participle non-finite clause.
