 Complete the following phrase:  After a massive management overhaul, with Sergio Marchionne and Maurizio Arrivabene replacing di Montezemolo and Mattiacci as Ferrari President and Team Principal respectively, the team enjoyed an improved start to the season, with Sebastian Vettel taking third in Australia. However, Räikkönen was forced to retire from the race due to a loose wheel. The team ended their 34-race winless streak in Malaysia when Vettel held off both Mercedes cars to claim his first victory since leaving Red Bull at the end of the previous year. Sebastian Vettel managed to win twice more for Ferrari in 2015, at the 