They were undone by a goal from John Barnes.是什么意思？

They were undone by a goal from John Barnes.

约翰·巴恩斯的一粒进球使他们落败。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

undone

adj. 已解开的，未做的，烦乱的，毁了的；v. 松开( undo的过去分词 )，解开，毁灭，败坏；

例句
They were undone by a goal from John Barnes...
约翰·巴恩斯的一粒进球使他们落败。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

goal

n. 目标，目的，球门，终点，得分；

例句
Their goal was extraordinarily ambitious.
他们的目标极其宏伟。

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

John

n. 茅房，厕所；

例句
He was appointed Apostolic Administrator of Minsk by Pope John Paul II.
他被教皇约翰·保罗二世任命为明斯克区的宗座署理。

Barnes

巴恩斯（姓氏）；

例句
How far did the film tell the truth about Barnes Wallis?...
影片讲述的巴恩斯·沃利斯的故事有多少真实的成分？