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.

BRUSSELS, July 30 (Reuters) - European Union antitrust regulators will decide by Sept. 2 whether to approve Royal Dutch Shell (LSE: RDSB.L - news ) 's planned 47 billion pound ($73.25 billion) buy of BG Group (LSE: BG.L - news ) to become the world's top liquefied natural gas company.

Answer: product_or_material_produced: BG Group, natural gas; parent_organization: BG Group, Royal Dutch Shell