Put the words in order to make a sentence with a non-defining relative clause. Add commas where necessary.

1 is/a/brother/lives/Birmingham/my/in/who/dentist
2 ate/Italy/where/stayed/in/ice cream // much/ too/I/summer/last
3 cost/trainers/she/sale/which/€20/the / bought/a/ online / only/in
4 Mount/same/who/John/Everest/me/as/climbed went/to/the/school/just
5 wife/is/works/the BBC/a/film/the/Stephen /for/ whose/director
6 century/the/ Shakespeare / alive/when/ was / dangerous/ 16th/time/a/was/live/to