Complex sentence: He was designated for assignment by the Royals on June 10 a month after being optioned to the Triple-A Omaha Royals He then joined the San Diego Padres organization, pitching for the Padres' Triple-A affiliate, the Portland Beavers.
Split into simpler sentences: He was designated for assignment by the Royals on June 10 a month after being optioned to the Triple-A Omaha Royals, and has since joined the San Diego Padres organization. He is currently pitching for the Padres' Triple-A affiliate, the Portland Beavers.