Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

LONDON, Sept 8 (Reuters) - A look at valuations illustrates how regulatory concerns and stubbornly low energy prices have stoked investor anxiety over Royal Dutch Shell (Xetra: R6C1.DE - news ) 's planned takeover of British rival BG Group (LSE: BG.L - news ) .

Answer: parent_organization: BG Group, Royal Dutch Shell