Complex sentence: Hijikata seems to be the most intelligent of the three girls, since she is seen relaxing in a hot spring by reading a Jules Verne book; she is also the most logical of them, to the point where Kondo often claims she's like a machine.
Split into simpler sentences: Hijikata seems to be the most intelligent of the three girls, since she is seen relaxing in a hot spring by reading a Jules Verne book. She is also the most logical of them, to the point where Kondo often claims she's like a machine.