Nounでもある
Usage
XはYでもある is used to introduce the second property of X when X has more than one property. Note that XもYだ is used when someone/something else is also Y. "Be also"
Examples
レオナルド・ダ・ピンチは芸術家でもあり、科学者でもあった。
Leonardo Da Vinci is an artist, but also a scientist.
京都という街は、古いお寺があるだけでなく、日本の伝統文化の中心地でもある。
Kyoto is a city, that not only has old temples, but is also centred around Japanese traditional culture.