Complex sentence: As a mathematics professor, he published a handful of papers, mostly on the history of mathematics and his career as an educator was somewhat hindered by a handicap of stammering (a difficulty Ranganathan gradually overcame in his professional life).
Split into simpler sentences: As a mathematics professor, he published a handful of papers, mostly on the history of mathematics. His career as an educator was somewhat hindered by a handicap of stammering (a difficulty Ranganathan gradually overcame in his professional life).