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.

On July 23rd, Firaxis Games released Ethiopia Pack as part of their bimonthly release of six downloadable content packs for the all-new Sid Meier's Civilization VI - New Frontier Pass for PlayStation 4, Xbox One, Nintendo Switch and PC.

Answer: platform: Civilization, PlayStation; platform: Civilization VI, Nintendo Switch; developer: Civilization VI, Firaxis Games; platform: Civilization VI, PlayStation