Example: Frank Zappa, who was one of the most creative artists in rock 'n roll, came from California.
Olympia, whose name is taken from the Greek, is the capitol of Washington State.
Relative Pronouns Used As The Object of Non-Defining Relative Clauses
Example: Frank invited Janet, who (whom) he had met in Japan, to the party.
Peter brought his favorite antique book, which he had found at a flea market, to show his friends.
NOTE: 'That' can never be used in non-defining clauses.
Relative Pronouns Used As A Possessive In Non-Defining Relative Clauses
Example: The singer, whose most recent recording has had much success, was signing autographs.
The artist, whose name he could not remember, was one of the best he had ever seen.
In non-defining relative clauses, which can be used to refer to an entire clause.
Example: He came for the weekend wearing only some shorts and a t-shirt, which was a stupid thing to do.
After numbers and words like many, most, neither, and some, we use of before whom and which in non-defining relative clauses. Example: Many of those people, most of whom enjoyed their experience, spent at least a year abroad. Dozens of people had been invited, most of whom I knew.Using Relative Clauses