Complex sentence: In preparation for the 2013--14 season she skated two sessions per day, gradually increasing the difficulty of her jumps and spins and aiming to add a triple-triple jump combination to her long program.
Split into simpler sentences: In preparation for the 2013--2014 season she skated two sessions per day, gradually increasing the difficulty of her jumps and spins. She planned to add a triple-triple jump combination to her long program.