Question

ｒｉｎｎｇｏ

画像の長文で オレンジの下線が引いてあるwhat is はどのような意味があるのか、またwhat isは英文でどのような構成で使われるのか教えて頂きたいです🙇‍♀️

Count Robert II lived in Hesdin Castle in what is now France during the late
Middle Ages. He and his family spent a lot of time and money making it a place that
guests would never forget.
Imagine being in a castle in the 15th century. You walk through a door for