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: FTSE 250 company Bwin, the PartyPoker and FOXYBingo owner which put itself up for sale last year, had considered GVC's initial joint approach with Canadian group Amaya as too complex and offering less attractive growth prospects.
user
legal_form: PartyPoker, company
assistant