Complex sentence: In 1957, A few weeks after the tragic loss of "Pamir" and shortly after having been severely hit by a storm, "Passa" was decommissioned, having experienced almost the same fate as the "Pamir" when her loose barley cargo shifted.
Split into simpler sentences: In 1957, a few weeks after the tragic loss of "Pamir" and shortly after having been severely hit by a storm, "Passat" was decommissioned. She had experienced almost the same fate as the "Pamir" when her loose barley cargo shifted.