Complex sentence: Repair work was completed at the "Kaiserliche Werft" in Wilhelmshaven by 20 April, allowing her to participate in the normal routine of training cruises and maneuvers with the fleet for the remainder of the year.
Split into simpler sentences: Repair work was completed at the "Kaiserliche Werft" in Wilhelmshaven by 20 April. She then participated in the normal routine of training cruises and maneuvers with the fleet for the remainder of the year.