LONDON, Dec 7 (Reuters) - Honda has restructured its under-performing Formula One operations after the split from McLaren, with Yusuke Hasegawa to stand down as head of the Japanese company's F1 project at the end of the year. Honda, starting a new partnership with Red Bull-owned Toro Rosso from January, said in a statement on Thursday that Hasegawa's position would be split into two separate functions. Toyoharu Tanabe, an experienced Formula One veteran who worked as race engineer to Austrian Gerhard Berger at McLaren in the early 1990s, had been appointed as F1 technical director. McLaren, who have Spain's double world champion Fernando Alonso along with Belgian Stoffel Vandoorne as their drivers, will have Renault power next season. Toro Rosso have New Zealander Brendon Hartley and France's Pierre Gasly.