Complex sentence: Santa Ana Winds FC left the NPSL after one season due to spats between owners who eventually split to keep the Santa Ana Winds FC name, while forming a startup development league called the United Premier Soccer League, which was also founded in Santa Ana.
Split into simpler sentences: Santa Ana Winds FC left the NPSL after one season due to a split between owners. One faction of ownership left and kept the Santa Ana Winds FC name, while forming a startup development league called the United Premier Soccer League, which was also founded in Santa Ana.