instruction:
In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
question:
Wave – particle duality is the concept in quantum mechanics that every particle or quantum entity may be partly described in terms not only of particles , but also of waves .
answer:
Wave – particle duality means that all particles show both wave and particle properties .


question:
In January 1905 , the institution of the City Governor , or Mayor , was officially introduced in Moscow , and Alexander Adrianov became Moscow 's first official mayor .
answer:
In January 1905 , Alexander Adrianov became Moscow ’ s first mayor .


question:
The European Commission acts both as the EU 's executive arm , responsible for the day-to-day running of the EU , and also the legislative initiator , with the sole power to propose laws for debate .
answer:

The European Commission runs the day-to-day running of the EU and writes laws , like a government .