Better explained here:
In 2015, Tony Stewart (Terence Maynard) grows tired of his girlfriend, current Rovers landlady Liz, and plots with secret lover Tracy to take the pub from the McDonald's. Tony falsely tells Liz's son, Steve, that he needs back the money that he lent him, forcing Steve to sell his 50% of the Rovers. Steve gets an offer from a pub chain called "Travis Limited" and accepts it, not knowing that Tony is the real buyer. After being successful in purchasing Steve's share of the pub, Tony sets in motion his mission to con Liz into selling her 50% to "Travis Limited" as well, persuading her that they should start afresh a little further away from Weatherfield. When she refuses, he arranges for two of his criminal friends to attack her in the bar. Tony manages to persuade Liz to sell up, promising a new life in Spain with her; however, Michelle's best friend, Carla Connor (Alison King), offers to buy Liz out of the pub. A furious Tony tries to persuade Liz to honour her deal with "Travis Limited" but Liz decides to sell her share to Carla, after Carla promises to keep Steve and Michelle as the pub's licensees. In revenge on Carla for offering to buy the Rovers, Tracy sets the Victoria Court flats on fire with Carla and her own daughter, Amy Barlow (Elle Mulvaney), trapped inside. Both Carla and Amy survived the blaze; however, Kal Nazir (Jimi Mistry) and Maddie Heath (Amy James-Kelly) both perish in an explosion during the fire. Before Carla can sign on the dotted line, Liz learns from a vengeful Tracy of Tony's plan to get the pub. Therefore, Liz still owns her half of the pub, while Tony owns the other half.
Liz McDonald and Steve McDonald (2015–Present)[edit]
(Beverley Callard and Simon Gregson)
In November 2015, Liz McDonald leads Tony Stewart to believe that they can reconcile their relationship if he hands back Steve's share of the pub. Tony succumbs and signs his 50% share over to Steve, making him the landlord again. Later, Tony proposes, hoping for a new start but Liz declines and humiliates Tony in front of the entire pub, telling him that their relationship is over.
https://en.wikipedia.org/wiki/Rovers_Return_Inn