Question

then there are 50( )so people we aren't so close

then there are 50( )so people we aren't so close with but get along with

Answer 1

or so，固定词组，ad..约莫，大约…左右;
所以整句话为:
then there are 50 or so people we aren't so close with but get along with.

翻译:这里大约有50个虽然关系不太亲密但是彼此之间相处融洽的人。

Answer 2

Then there are 50 (or) so people we aren't so close with but get along with one another，意思是 “有大约五十个关系不十分密切但还处得来的人”。

Answer 3

nationalities 民族

Answer 4

Then there are 50 or so people 有50个左右
or so:左右;大概 ; 差不多