In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.

Q: in popular music , a side project is a project undertaken by one or more persons already known for their involvement in another band.

A: in popular music , a side project is made by one or more persons already known for being in another band.
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Q: the string can vibrate in different modes just as a guitar string can produce different notes , and every mode appears as a different particle : electron , photon , gluon , etc.

A: the string can vibrate as a guitar string and produces different notes.
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Q: he was an exceptionally active campaigner and critic in the crisis years in italy after the first world war and into the early years of fascist rule.

A:
he was very active in the politics of italy during the crisis years after world war one and in the early years after that.
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