Complex sentence: Officially, the Saudi government took the position of not aggressively taking the mosque, but rather to starve the militants, never the less several unsuccessful assaults were undertaken, at least one of them trough the underground tunnels in and around the mosque.
Split into simpler sentences: Officially, the Saudi government took the position of not aggressively taking the mosque, but rather to starve the militants. Nevertheless, several unsuccessful assaults were undertaken, at least one of them trough the underground tunnels in and around the mosque.