Translate the following English sentence to French:
"It was only after they unsuccessfully solicited the FPÖ to tolerate a minority government and, obviously in vain, offered the Freedom Party ministerial posts, that the SPÖ begin its massive campaign against Haider."
Ce n'est qu'après avoir enjoint, sans succès, le FPÖ de tolérer un gouvernement de minorité et, apparemment, avoir vainement offert des postes ministériels aux libéraux que le SPÖ a commencé sa campagne massive contre Haider.