to which it is a party这个定语结构，可以换一种形式理解“it is a party to XXX”,XXX指某种文件，因为是定语，所以就是“其作为一方当事人的XXX文件”。

例句1

Any Obligor Party (other than the Sponsor) does not comply with any provision of the Finance Documents (other than the provisions to which paragraph (a) or (b) above applies) to which it is a party unless the non-compliance is capable of remedy and is remedied within 14 days of the earlier of (i) the Facility Agent giving notice to the Borrower of the failure to comply and (ii) that Obligor Party becoming aware of the failure to comply.

任何债务人（担保人除外）没有遵守其作为一方当事人的融资文件的任何条款（除上文(a)款或(b)款适用的规定以外），除非该等违约行为可以补救并且在以下两者较早发生的时间14天内完成补救：(i) 贷款代理行向借款人发出违约通知；或者(ii)债务人意识到发生违约行为。

例句2

The Purchaser has all requisite power, authority and capacity to enter into this Agreement and other Transaction Documents to which it is a party, and to perform its obligations hereunder and thereunder.

受让方拥有签署本协议以及其作为其中一方的其他交易文件及履行本协议以及其作为其中一方的其他交易文件项下的义务所需的各种权力、授权和能力。