Background: Geoff Tate (born Jeffrey Wayne Tate, January 14, 1959; he later changed his first name to Geoffery or Geoffrey) is a German-born American singer and musician. He rose to fame with the progressive metal band Queensryche, who had commercial success with their 1988 album Operation: Mindcrime and 1990 album Empire. Tate is ranked fourteenth on Hit Parader's list of the 100 Greatest Metal Vocalists of All Time.
Context: Since 2012, Geoff Tate has attracted some controversy, mostly in part to the circumstances surrounding the split with Queensryche (when his bandmates, guitarist Michael Wilton, bassist Eddie Jackson and drummer Scott Rockenfield fired him from the band and replaced him with then-Crimson Glory vocalist Todd La Torre). Tate attracted negative attention for spitting on and physically assaulting Wilton and Rockenfield before and during a show in Sao Paulo, Brazil, on April 14, 2012. Then, during a later show the Rocklahoma Festival on May 26, Tate commented to an unresponsive crowd "You guys suck," which his bandmates, as well as some fans, felt was an insult, but Tate would later defend his actions by stating in a court declaration "I was not insulting the audience. I was trying to motivate or excite them." He finds that this was used against him in the lawsuit: "It's just something that the other guys [in the band] and their team of people are trying to twist into a 'Geoff doesn't respect the fans' type of thing." He elaborated on that in an interview, saying: "I say that stuff all the time, you know. It's part of being a front man, you know. You got to motivate the audience, you know. And I say things to get people motivated. I think... I say things to push people's buttons to get them to react. It's part of a performance. But if you're in a lawsuit, of course, these things get taken out of context and put into a new format. I guess the objective is to make me look like I don't care about the fans. Which is unfortunate." During the "Operation: Mindcrime Anniversary Tour" tour, ten minutes into a show in St. Charles, Illinois on May 17, 2013, Tate grabbed an audience member's smartphone, turned around, and threw it over his shoulder into the crowd.On the subject, Tate commented: "Some actions that I have become very normal with as a performer are getting scrutinized and manipulated to paint a picture of me [to make me look like a bad guy]." He accused the uploader of the video showing this footage to have manipulated the footage to make it appear as though he threw it, as he insists that he accidentally dropped it while trying to take pictures of the fan and of himself. Tate has commented on these controversies in relation to the Queensryche lawsuits, saying: "I guess that's the nature of being in a lawsuit. Now you have to watch what you say, and trust that who you are talking to does the right thing, you know, and push the information out in the way that it happened. And not try to construct something different, you know?"
Question: What happened that made them split?

Answer:
(when his bandmates, guitarist Michael Wilton, bassist Eddie Jackson and drummer Scott Rockenfield fired him from the band and replaced him with then-Crimson Glory vocalist Todd La Torre).