再細壹點就是，盡管中心詞是seeds，但是在這裏的seeds是disaffection’s seeds, 應該視為不可數名詞，所以用was而不是 were。
social development was stunted and the seeds of disaffection sown.這句話拆開是：
social development was stunted， the seeds of disaffection WAS sown.
並列句中,如果句型相同,如都是主謂賓結構, 後面壹個句子的主語與前面句子的主語相同就可以省略主語. 如果是主系表結構, 後面壹個句子的相同的系動詞就可以省略. 所以合起來就是
social development was stunted and the seeds of disaffection sown.
例:He likes dancing，he also likes singing.
這兩句話都是主謂賓結構，所以就可以用and 合並為壹個並列句，後壹句省略主謂語he likes. 即：He likes dancing and singing.
例：Tom's hat is blue， Lily's hat is red.
這兩句是主系表結構．主語不同，但系動詞相同都是is. 那麽就可以合為：
Tom's hat is blue and Lily's red．