Complex sentence: He was unable to prevent Coevorden from surrendering in September 1592 and the Capture of Groningen on July 22,1594, and was thus recalled from Friesland by Archduke Ernest of Austria.
Split into simpler sentences: He was unable however to prevent Coevorden from surrendering in September 1592. Finally he was also unable to prevent Groningen from falling on July 22,1594, and was thus recalled from Friesland by Archduke Ernest of Austria.