Add punctuation: But even this plan failed the thing went through the ceiling as quietly as possible as if it were quite used to it
A: But even this plan failed: the 'thing' went through the ceiling as quietly as possible, as if it were quite used to it.
QUESTION: Fix punctuation: The mentioned newconstructions presumable were the boats S314 through S320 which were never commissioned
ANS: The mentioned new-constructions presumable were the boats S-314 through S-320, which were never commissioned.
QUES: The narrowing from rheumatic fever occurs from the fusion melting together of the edges commissures of the valve leaflets

correct the punctuation.

CORRECTED: The narrowing from rheumatic fever occurs from the fusion (melting together) of the edges (commissures) of the valve leaflets.
Question: Repeat the dec on the following round 14 sts
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Answer: Repeat the dec on the following round = 14 sts.
But cracking down on Shensi in favor of Honan would have upset the delicate balance of power the government found so essential to its functioning

Can you repeat this sentence, but add in punctuation?
But cracking down on Shensi in favor of Honan would have upset the delicate balance of power the government found so essential to its functioning.
QUESTION: Fix punctuation: It will support actions addressing all aspects of migration including asylum legal migration integration and the return of irregularly staying nonEU nationals
ANS:
It will support actions addressing all aspects of migration, including asylum, legal migration, integration and the return of irregularly staying non-EU nationals.