Herkese merhabalar bir sorum var

facebookta gördüm ki, birisi dedi ki "kardeş sayfamiz olan Osman Ali sayfasını hepimiz bekliyoruz" 

My question exactly is, what are the different usages of "olan" and what does it mean in that sentence above? I keep seeing different ways of it being used and I don´t get it. Can someone clear my confusion please? Thanks in advance. 

what does it mean in that sentence above? ---> which

"kardeş sayfamiz olan Osman Ali sayfasını hepimiz bekliyoruz" 

We all are waiting for the page called Osman Ali which is our brother [sister] page "

Şapkası pembe olan kadının adı Lesley. 

Name of the woman -who has pink hat -is Lesley.

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Kebabı meşhur olan Destan Restoran Üsküp´tedir.

Destan Restaurant which is famous with its Kebap is in Skopje.

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Türkçesi iyi olan adam forumda ilginç bir soru sordu.

The man whose Turkish is good , asked an interesting question in the forum.

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Sabah otobüsle gelmiş olanlara sordum.

I asked the ones who had came by bus this morning.

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Beyaz bacası olan evde amcam oturuyor.

My uncle is living in the house which has a white chimney.

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Vizesi dolmuş olan ingiliz çift sınırdışı edildi.

An English couple whose visa was expired were deported.

thanks for your clarification! makes sense to me now

Not that you asked, but;

"facebookta gördüm ki, birisi dedi ki" sounds strange. "Facebook´ta birisi dedi ki" is better. Don´t you think?

"I´ve seen on Facebook that someone had said that ..."

or

"Someone on Facebook said ..."

Yeah that sounds better. Sometimes I translate too much word for word when it comes to the way I speak my engish. That has to stop cause it comes out awkward sounding in turkish lol

The suffix -en/-an makes the verb an adjective. This suffix shows the relationships of the situations and the people/things. The tense is unclear. It is understood later.

olmak (to be)

ol+an----------------------->olan (that is ...)

kardeş (sibling : brother or sister)

sayfa (page)

kardeş sayfamız (our partner page)

Osman Ali sayfası (the page Osman Ali)

kardeş sayfamız olan Osman Ali sayfası (the page Osman Ali that/which is our partner page)

____

satmak (to sell)

bilge (monk)

Ferrari´sini satan bilge (the monk who sold his Ferrari)

olmak, meydana gelmek (to occur, to happen)

Japonya´da meydana gelen kasırga (the storm that has happened in Japan)

for the details:

http://www.turkishclass.com/turkish_lesson_356

http://www.turkishclass.com/turkish_lesson_357