In order to obtain a biomarker for diagnostics , the sample material must be as easy to handle as possible .
In order to use a biomarker for diagnostics , the sample material must be as easy to obtain as possible .

Are these two sentences paraphrases of each other?
no

Guruzeta 's father , Xabier , was also a footballer . A central defender , he mainly represented Real Sociedad during his career .
Also the father of Guruzeta , Xabier , was a footballer , as a central defender he represented mainly Real Sociedad during his career .

Are these two sentences paraphrases of each other?
yes

A documentary about Lee and his wife Opal , directed by Jeff Silva and Vic Rawlings , is being filmed .
A documentary film is being made about Opal and his wife Lee , directed by Jeff SIlva and Vic Rawlings .

Are these two sentences paraphrases of each other?
no

Cowles ( 1911 ) wrote about distinguishing clements between primary succession and secondary succession :
About Clements ' distinction between primary succession and secondary succession , Cowles wrote ( 1911 ) :

Are these two sentences paraphrases of each other?
yes