Using relative clauses

Hello everyone:
I really liked this activity, it was very interesting, also i learned a lot, like knowing how to separate two sentences into one by a connector that can be, for things: which/that; for places: where; and for people: who. Well these are my 5 sentences of each one:

Person
1.-He was born in Sao Paolo which is located in Brazil.
2.-He made an act of peace that consisted on a strike of hungry.
3.-He was born in Polony which is located in Europe.
4.-He was an adventurer who was attacked by an animal.
5.-He was a young computer technician who made one of the biggest computer companies in the world.

Things
1.-It is an artefact that can be used to kill.
2.-It is the technic that ancient people used to make vegetables.
3.-It is one of the most beautiful paintings that was made by an italian artist.
4.-It is the thing that you use to keep your clothes clean.
5.-It was build in 1500 that was use to pray.

Places
1.-It has very famous stores where you can buy a lot of things.
2.-There they play good music where you can relax.
3.-There are pyramids where tourists can pass a good time.
4.-It has large areas where you can see animals.
5.-It has a world famous amusement park where everyone can have fun.

Bye... take care