QUES: Rupture of an abdominal aneurysm is a catastrophe

correct the punctuation.

CORRECTED: Rupture of an abdominal aneurysm is a catastrophe.

QUES: Within a few decades the Second International intertwined itself with the bourgeois democratic regime became in fact a part of it and is rotting away together with it

correct the punctuation.

CORRECTED: Within a few decades the Second International intertwined itself with the bourgeois democratic regime, became, in fact, a part of it, and is rotting away together with it.

QUES: In the British House of Commons 369 members voted in favour of the United Kingdom staying in the Community with 170 voting against it

correct the punctuation.

CORRECTED:
In the British House of Commons, 369 members voted in favour of the United Kingdom staying in the Community with 170 voting against it.