Period may be extended upon expiration (through agreement).

通过协议可以延长期限。

《新英汉大辞典》

Upon expiration of the term for an outdoor advertising facility, the applicant of the installation shall promptly remove the facility.

户外广告设施设置期满后，设置申请人应当及时撤除。

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Upon expiration of their terms, they shall either carry out de-registration procedures or, as required, apply for establishment as a branch.

期限届满以后，应当办理注销登记或根据需要申请设立分公司。

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And -- nationals could be subject to deportation and separation from their spouses upon expiration of temporary visas.

WHITEHOUSE: Press Briefing

The company arranged for 75 lease buyouts, 50 short-term lease extensions and lease terminations upon expiration for about 115 stores.

FORBES: Retail and Apparel News: Pacific Sunwear, G-III

To counter the competition and compensate for loss of Starz content upon deal expiration, Netflix has been continuously enhancing its streaming library with both older and new exclusive titles.

FORBES: Netflix Trying To Counter Competitors, Stock Streaming To $133