QUESTION: Fix punctuation: We treat all our customers according to these rules
ANS: We treat all our customers according to these rules:

QUESTION: Fix punctuation: This in turn is equivalent to computing the line integral around the path created by path 2 to path 1 in a reverse direction
ANS: This in turn is equivalent to computing the line integral around the path created by path 2 to path 1 in a reverse direction.

QUESTION: Fix punctuation: There are probably many different opinions about exactly why gardens attract children but Thomas Bergenholtz Hgedals personal experience indicates that it is because they regard the garden as a haven
ANS: There are probably many different opinions about exactly why gardens attract children, but Thomas Bergenholtz Hgedal's personal experience indicates that it is because they regard the garden as a haven:

QUESTION: Fix punctuation: He was thus reduced to cultivating his intellectual interests and often took part in public life under a transparent pseudonym
ANS:
He was thus reduced to cultivating his intellectual interests, and often took part in public life under a transparent pseudonym.