sentence: Recently , he visited Moscow and while we were having a conversation , I mentioned that I was looking for an opportunity to work in a postdoc position abroad .
modified: Recently he has visited Moscow and while we 've been having conversation I 've mentioned that I was looking for the opportunity to work on postdoc position abroad .
transformation: PUNCT, VERB:TENSE, VERB:TENSE, DET, PUNCT, CONTR, DET, OTHER