Shorten the clauses with who,which or that..

plz guys help me figuring this thing out , my final exam is tomorrow
and there is this tough question .. it's really confusing me ,,

Shorten the clauses with who,which or that..

1.KFUPM , which was founded in 1963 , is one of the smallest universities.
I'm pretty sure that we can shorten it as this
KFUPM is one of the smallest universities.
because that won't affect the meaning "we still have a proper sentence" , another reason is that we have TWO commas around the clause

now see those examples
The students who were sent to England learned to speak excellent English .
I believe that we can shorten it as this
The students learned to speak excellent English .
because that wont affect the meaning , But the problem is that we don't have TWO commas around the who clause.
so is it right ???
Another one is
The quantity of the mail that is handled by the postal service has increased .
I believe that we can shorten it as this
The quantity of the mail has increased .
because that wont affect the meaning , But the problem is that we don't have TWO commas around the who clause.
so is it right ???

am I right in non-affecting the meaning point :( or what ??
please help me am so confused .

اذا كانت صيغة السؤال نكتفى بحذف الاسم الموصول مع الفعل المساعد الذى يتبع فقط وتبق بقية الجملة كما هى . shorten the clause with who ,which or that
the car which was bought by my brother is expensive.
the car bought by my brother is expensive .
اما اذا كانت صيغة السؤالtake out the clause if possible الامر هنا يختلف فى الحل مثال :
Mrs. Sara, who comes from Saudi Arabia, teaches us English .
Mrs .Sara teaches us English .فى هذه الجملة حذفنا جملة الاسم الموصول لان حذفها لا يؤثر على معنى الجملة . لكن فى المثال التالى لا نستطيع حذفها لان وجودها اساسى فى الجملة .
people who drive carelessly cause accidents .
هنا لا نستطيع القول people cause accidents.لان هذا لا ينطبف على جميع الناس .
اتمنى لك الفائدة.

يسلمووووووووووووووو

الله يرضى عليكم000و يعطيكم الف عافية00

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السلام عليكم ورحمة الله وبركاته

بالتوفيق في اختبارك

ويعطيك ألف عافية العز عنواني
لاحرمت الأجر والمثوبة

when dealing with taking out who what or which, you need to locate the phrase which includes who which or what up to the next verb regardless being doing, state or have

الله يعطيك العافيه