Complex sentence: Nakaoji is sporty, friendly, and good with kids, though he and Aram sparred because Nakaoji had lost patience with Aram who disliked him right from the start because he knew that Airi liked Nakaoji and was determind to get catch Airi's heart.
Split into simpler sentences: Nakaoji is sporty, friendly, and good with kids, though he and Aram sparred. This is because Nakaoji had lost patience with Aram who disliked him right from the start, as he knew that Airi liked Nakaoji and was determind to get catch Airi's heart.