I know that I can omit the italic part below in daily speech or casual writing. Is it against formality to omit such things in, for example, an article or essay?

Research (that is) led by the Museum of London has revealed two more individuals of Asian ancestry, buried among the remains of other citizens of ancient Londinium.

  • I think that it's safe to omit it, even in formal speech. Only a pedant would pick you up on it these days. Maybe this is a good question for the grown-ups in English.SE. – Mick Sep 23 '16 at 18:49
  • @MickSharpe It's a common or garden variety ellipsis. – P. E. Dant Reinstate Monica Oct 2 '16 at 7:16

You may omit "that is" from a sentence like this in formal writing, and you should.

Reason: in formal writing, this type of conciseness is good. It helps the reader focus on your ideas, rather than getting distracted by your sentence structure concerns.

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