QUES: We always conduct comprehensive risk assessment when embarking on a new contract

correct the punctuation.

CORRECTED: We always conduct comprehensive risk assessment when embarking on a new contract.

QUES: There he was a postdoctoral worker at Chicago where he collaborated with Bliss and then at Harvard

correct the punctuation.

CORRECTED: There he was a postdoctoral worker at Chicago, where he collaborated with Bliss , and then at Harvard.

QUES: They are far more flexible to position than their predecessors

correct the punctuation.

CORRECTED:
They are far more flexible to position than their predecessors.