Complex sentence: At major championships, the title is decided on a'best of three races' format; earlier races may involve more than two riders, with the winners automatically advancing to the next round while the losing riders get a second chance by competing in repercharge races.
Split into simpler sentences: At major championships, the title is decided on a'best of three races' format. The initial races may involve more than two riders, with the winners automatically advancing to the next round while the losing riders get a second chance by competing in repercharge races.