Problem: S1: Often , prepared packs are warm ; the heat opens up the pores of the skin , and helps the interaction of the clay with the body .
S2: Prepared packs are often warm , the heat opens the pores of the skin and supports the interaction of the clay with the body .

Do S1 & S2 convey the same information?

A: yes

Problem: S1: The Squadron RAF was a unit of the Royal Air Force in Egypt during the Second World War and then in Italy and North Africa .
S2: 651 Squadron RAF was a unit of the Royal Air Force in Italy and North Africa during the Second World War and afterwards in Egypt .

Do S1 & S2 convey the same information?

A: no

Problem: S1: He left Egypt to Cairo , where he met in Tunis Mahmud al-Kurdi of the Khalwati Order .
S2: He left Egypt for Cairo where he met Mahmud al-Kurdi of the Khalwati order in Tunis .

Do S1 & S2 convey the same information?

A:
yes