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

input: It can be converted into an image or downloaded as a data file
fixed: It can be converted into an image or downloaded as a data file.

input: Although he was totally innocent his father disappeared in the Gulag two years later and became one of the millions to perish under Stalin
fixed: Although he was totally innocent, his father disappeared in the Gulag two years later and became one of the millions to perish under Stalin.

input: But had they known it so they had wanted to know the previous language with etc I think I got all my questions answered and consider myself to know a little more about the subject now
fixed:
But had they known it so they had wanted to know the previous language with etc. I think I got all my questions answered, and consider myself to know a little more about the subject now.