Problem: (1) English is understood by many people and spoken fluently by some .
(2) English is spoken by many people and understood by some of them fluently .

Do (1) and (2) mean the same thing?
A: no

Problem: (1) This theory did not explain the observed instability of irreversible dispersions against colloidal aggregation in solutions with high ionic strength .
(2) This theory did not explain the observed instability of irreversible dispersions against colloidal aggregation in solutions of high ionic strength .

Do (1) and (2) mean the same thing?
A: yes

Problem: (1) The valley itself is made lush and green by the river , while the surrounding area is rocky desert .
(2) The valley itself is made through the river and green , while the surrounding area is rocky desert .

Do (1) and (2) mean the same thing?
A: yes

Problem: (1) Danny Danny Kortchmar played guitar , Charles Larkey played bass and Gordon played drums producing with Lou Adler .
(2) Guitar played Gordon , Danny Kortchmar Bass and Lou Adler drums producing with Charles Larkey .

Do (1) and (2) mean the same thing?
A:
no