considerable主语 grow谓语
According to the passage 状语
in the trade union movement 后置定语修饰主语
from the outdated and ineffcient structure of the trade unions strains and tensions.状语,修饰谓语
其中 the outdated 和ineffcient structure 并列,而the trade unions strains 和tensions并列,共同做定语修饰ineffcient structure