MILAN (Reuters) – The head of Telecom Italia’s (TIM) network is expected to leave after the summer, two sources said on Sunday, in a move that may further complicate the phone group’s plan to split its fixed grid infrastructure from its services unit to cut debt. Stefano Siragusa, who joined TIM as chief infrastructure officer in 2018, has been at odds over strategy with Chief Executive Pietro Labriola, the company’s fifth CEO in six years, the people familiar with the matter said, but added that discussions over his future were still ongoing. TIM said in a statement it had “not made any annou…