(ShareCast News) - Vodafone announced a number of changes to its European leadership structure intended to simplify organisational processes, enhance management efficiency and accelerate decision-making.The company said that with effect from 1 October, the chief executives of its four largest European markets - Germany, Italy, the UK and Spain - will become members of the Group Executive Committee and will report directly to Vodafone group chief executive Vittorio Colao.The chief executive of Vodafone Netherlands, Rob Shuter, will also join the Group Executive Committee and will assume additional leadership responsibilities for Vodafone's smaller European markets, reporting directly to Vittorio Colao. Corporate functions operating at regional level in Europe will be integrated within the respective group functions.The company also said that chief executive for the Europe region, Philipp Humm, will leave the group later in the year to continue his CEO career outside Vodafone.Colao said: "These changes will simplify and streamline the management of our largest European markets and accelerate our strategic plans in those countries as convergence gathers pace and our Project Spring organic investment programme and focus on efficiency deliver visible results."At 11:10, Vodafone shares were down 0.5% at 237.72p.