QUESTION: Fix punctuation: They are rarely of a malignant nature they will grow within the space but not spread to the surrounding organs
ANS: They are rarely of a malignant nature; they will grow within the space but not spread to the surrounding organs.

QUESTION: Fix punctuation: Stocks with sell signals from volume balance have also risen but except for Finland they have risen significantly less than average benchmark index development
ANS: Stocks with sell signals from volume balance have also risen, but, except for Finland, they have risen significantly less than average benchmark index development.

QUESTION: Fix punctuation: His formal education lasted less than two years and so he was mainly selfeducated aided by the convenient access to books provided by an apprenticeship in the printing business
ANS: His formal education lasted less than two years, and so he was mainly self-educated, aided by the convenient access to books provided by an apprenticeship in the printing business.

QUESTION: Fix punctuation: One can overburden it with more work than it is built to bear it must then be weakened and finally succumb
ANS:
One can overburden it with more work than it is built to bear; it must then be weakened and finally succumb.