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.
Text: Western Digital Chief Executive Steve Milligan said in an interview that the Sandisk acquisition will ultimately dilute Unisplendor's stake and that he was highly confident it would be approved by regulators.
user
owned_by: Sandisk, Western Digital; owner_of: Western Digital, Sandisk; parent_organization: Sandisk, Western Digital; subsidiary: Western Digital, Sandisk
assistant