On the second day Jess sees a girl who sees her lost sister Jen very similar .
On the second day , Jen sees a girl very similar to her lost sister , Jess .

Are these two sentences paraphrases of each other?
no

Serena soon found out that Blair had slept with her boyfriend , Nate Achirawat , the night of her disappearance .
Serena soon finds out that Blair had slept with her boyfriend , Nate Achirawat , the night of her disappearance .

Are these two sentences paraphrases of each other?
yes

The current 16th Street Clubhouse was constructed under the leadership of Horace Trumbauer by architect George D. Widener .
Under the leadership of George D. Widener , the current 16th Street Clubhouse was built by architect Horace Trumbauer .

Are these two sentences paraphrases of each other?
no

In 2003 the excavation works began on the eastern hill , on the western hill in 2006 .
In 2003 , excavation work began on the eastern hill , in 2006 on the western hill .

Are these two sentences paraphrases of each other?
yes