Complex sentence: His teacher Gopal Mishra said that vice chancellor B. Pandey encouraged him, and added that Joshi has been topping in the university for the last two years, achieving eighty percent, and has received a gold medal in Lucknow for that.
Split into simpler sentences: His teacher Gopal Mishra said that vice chancellor B. Pandey encouraged him. He added that he has been topping in the university since the last two years, archiving eighty percent, and has received a gold medal in Lucknow for that.