Complex sentence: On 16 May, they laid siege to Gaimou (Kaemo), which fell after only 11 days, capturing 20,000 people and confiscating 100,000 "shi" (6 million liter) of grain.
Split into simpler sentences: On 16 May, they laid siege to Gaimou (Kaemo). They also confiscated 100,000 "shi" (6 million liter) of grain.