But , its southern border along the Douro made the region susceptible to Spanish and Moorish conflict .
But its southern border along the Douro has made the region susceptible to Spanish and Moorish conflict .

Are these two sentences paraphrases of each other?
yes

Basque players , playing for either the Spanish or the French teams , dominate international competitions .
French players playing for either the Spanish or the Basque team dominate international competitions .

Are these two sentences paraphrases of each other?
no

Chelsey Tregear ( also known as Chelsey Nash ) is an Australian netball player in the ANZ Championship , playing for the Melbourne Vixens .
Chelsey Tregear ( also known as Chelsey Nash ) is an Australian netball player in the ANZ Championship and playing for the Melbourne Vixens .

Are these two sentences paraphrases of each other?
yes

Humphrey , however , supported McKeithen in 1968 at the Democratic National Convention in Chicago .
However , in 1968 , McKeithen Humphrey had supported the Democratic National Convention in Chicago .

Are these two sentences paraphrases of each other?
no