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Republican leaders abruptly pulled their overhaul of the nation’s health-care system from the House floor on Friday, a dramatic defeat for President Trump and House Speaker Paul D. Ryan that leaves a major campaign promise unfulfilled and casts doubt on the Republican Party’s ability to govern.
长难句解析：
识别主干：Republican leaders abruptly pulled their overhaul of the nation’s health-care system from the House floor on Friday
切成成分+独立成句：
1. a dramatic defeat for President Trump and House Speaker Paul D. Ryan同位语
=This is a dramatic defeat for President Trump and House Speaker Paul D. Ryan
(this= 句子)
2. that leaves a major campaign promise unfulfilled and casts doubt on the Republican Party’s ability to govern. 定语从句
That= defeat
参考译文：共和党领导人周五突然从众议院撤回旨在改革全国医保系统的法案。这对特朗普总统和众议院议长保罗•瑞恩来说堪称重挫，这个大选时作出的重要承诺未能兑现，令共和党的执政能力受到质疑。
词汇突破：
1.Abruptly 突然地;意外地
2.Overhaul 大修;改革
3.Dramatic 戏剧性的;重大的
4.Unfulfilled 未兑现的;未实现的
5.Cast doubt on 引起怀疑
6.Govern 治理;执政