Problem: S1: It was originally developed by groups of Chinese and Russian scholars in the Soviet Union and used by Chinese immigrants there until the majority of them left the country .
S2: It was originally developed by groups of Chinese and Russian scholars in the Soviet Union , and used by Chinese immigrants there until the majority left the country .

Do S1 & S2 convey the same information?

A: yes

Problem: S1: While osteopathic medicine has followed the development of society , allopathic medicine is a recent development .
S2: While allopathic medicine has followed the development of society , osteopathic medicine is a more recent development .

Do S1 & S2 convey the same information?

A: no

Problem: S1: Some organic compounds are valid minerals , which are recognized by the IMA ( CNMNC ) .
S2: Some valid compounds are organic minerals , recognized by the CNMNC ( IMA ) .

Do S1 & S2 convey the same information?

A:
no