You are the bows from which your children As living arrows are sent forth.

from後面那句話都是用來修飾bows的，其中as

living

arrows（介詞短語）修飾your

children,

are

sent

forth是個被動語態，指被朝外發出。

分為兩句就是：You

are

the

bows(弓).

Your

children

as(作為)

living

arrows

are

sent

forth(朝外)

from

the

bows.

直譯過來就是：妳們是弓，妳們的孩子作為生命之箭是從弓裏被往外射出的。整合起來就是：妳是弓，兒女是從妳那裏射出的箭。