Add punctuation: The fastest and easiest way to open your GPT file is to doubleclick it
A: The fastest and easiest way to open your GPT file is to double-click it.

Add punctuation: The theory and the application 1960 and Algebra and the number theory 1962
A: The theory and the application (1960), and Algebra and the number theory (1962).

Add punctuation: The supernatant was transferred to a flask while the pellet was redissolved in acetonitrile ultrasonicated and centrifuged using the same procedure
A:
The supernatant was transferred to a flask, while the pellet was redissolved in acetonitrile, ultrasonicated and centrifuged using the same procedure.