Complex sentence: When his attempt was rebuffed, he left rather than change to soft-spiked shoes, and argued that since spiked shoes were allowed in the U.S. Open, the following week, that they should be allowed at sectional events.
Split into simpler sentences: When his attempt was rebuffed, he left rather than change to soft-spiked shoes. He argued that since spiked shoes were allowed in the U.S. Open, the following week, that they should be allowed at sectional events.