Simplify the following text for a Grade 13 native English-speaking person.
Original: Alexander Stepanovich Popov ( ; â `` ) was a Russian physicist who first demonstrated the practical application of electromagnetic ( radio ) waves , although he did not apply for a patent for his invention .
Simplified: Alexander Stepanovich Popov ( â `` ) was a Russian physicist and inventor who first showed how to use electromagnetic ( radio ) waves , although he did not apply for a patent for his invention .