Complex sentence: On 19 December 1936, after the Italians pinned him down on the north bank of the Gojeb River, "Ras" Imru surrendered, the Black Lions organization collapsed and many of its members were liquidated.
Split into simpler sentences: On 19 December 1936, after the Italians pinned him down on the north bank of the Gojeb River, "Ras" Imru surrendered. The Black Lions organization then collapsed and many of its members were liquidated.