In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

Q: When rainbands near frontal zones get close to steep mountains , a low-level barrier jet stream forms parallel to and just before the mountain ridge .

A: When bands of precipitation near frontal zones approach steep topography , a low-level barrier jet stream forms parallel to and just prior to the mountain ridge , which slows down the frontal rainband just prior to the mountain barrier .
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Q: Pelagia noctiluca is a jellyfish .

A: Pelagia noctiluca is a jellyfish in the family Pelagiidae and the only currently recognized species in its genus .
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Q: Belarus said it was free on 27 July 1990 .

A:
Belarus declared itself sovereign on 27 July 1990 by issuing the Declaration of State Sovereignty of the Belarusian Soviet Socialist Republic .
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