Complex sentence: Tooru soon become good aquantainces with everyone and quite good friends with Katsuji.However seeing the true Minato and Tooru being so close Shinji starts feeling jealous and meddles in their affairs and later Shinji blackmails Minato into dating him again or else telling Tooru the truth.
Split into simpler sentences: Tooru soon become good aquantainces with everyone and quite good friends with Katsuji. However, seeing the true Minato and Tooru being so close Shinji starts feeling jealous and meddles in their affairs and later Shinji blackmails Minato into dating him again or else telling Tooru the truth.