Complex sentence: Although he also considered studying linguistics Medvedev later said he never regretted his choice, finding his chosen subject increasingly fascinating: lucky "to have chosen a field that genuinely interested him and that it was really' his thing".
Split into simpler sentences: Although he also considered studying linguistics, Medvedev later said he never regretted his choice, finding his chosen subject increasingly fascinating. He said he was lucky "to have chosen a field that genuinely interested (him) and that it was really' his thing".