《新唐书·列传·卷一百四十五》
不久，福信杀了道琛，收并其兵，扶余丰无力控制。
福信俄杀道琛，并其兵，丰不能制。
Before long, Fuxin killed Daochen, took his soldiers in, Fuyu Feng had no ability to control.
<s>[INST] Kindly elucidate the central themes in this passage in English: 福信俄杀道琛，并其兵，丰不能制。 [/INST] Before long, Fuxin killed Daochen, took his soldiers in, Fuyu Feng had no ability to control.</s>
Kindly elucidate the central themes in this passage in English: 福信俄杀道琛，并其兵，丰不能制。
user
Before long, Fuxin killed Daochen, took his soldiers in, Fuyu Feng had no ability to control.
assistant