John John F. A. Cecil ( the only child of George and Cornelia Stuyvesant Vanderbilt ) married the British aristocrat William Cecil , a descendant of Edith Vanderbilt in 1924 .
John F. A. Cecil ( George and Cornelia Stuyvesant Vanderbilt 's only child ) married British aristocrat , William Cecil , a descendant of Edith Vanderbilt in 1924 .

Are these two sentences paraphrases of each other?
yes

The defect in the mechanism could not be seen in flight and only could be detected by examining the screw and checking it for defects during maintenance .
The defect of the mechanism could not be seen in the flight and could only be detected by checking the screw and checking it during maintenance for defects .

Are these two sentences paraphrases of each other?
yes

The finished product has been marketed in Europe and Australia as '' UFO : Enemy Unknown `` and in North America as '' X-COM : UFO Defense '' .
The finished product was marketed as `` UFO : Enemy Unknown '' in Europe and Australia and as `` X-COM : UFO Defense '' in North America .

Are these two sentences paraphrases of each other?
yes

Dowa is a district in the central region of Malawi and is the capital city of Dowa .
Dowa is a district in the Central Region of Malawi . The capital is Dowa .

Are these two sentences paraphrases of each other?

yes