请专业人士来判断一下,此英文句子是复合句还是简单句
Havingenduredamiserablynegativecampaign,theworld’smostpowerfulcountrynowhasamuchmoredifficultdecisiontomakethanitfacedfouryearsago.
"itfaced"有主语和谓语,算不算一个independentclause?
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