Complex sentence: During both the anime and manga series he begins a similar journey to Hikari in the sense that he also dreams of winning the Olympics and while working on doing so he develops feelings for Hikari and Shiina, but does not know which one to choose.
Split into simpler sentences: During both the anime and manga series he begins a similar journey to Hikari in the sense that he also dreams of winning the Olympics. While working on doing so he develops feelings for Hikari and Shiina, but does not know which one to choose.