Complex sentence: The standard 6 pounder shot was effective frontally only at short ranges and only at limited angles and in case of the Panther only able to penetrate the turret, but it was still effective against them from other angles at longer ranges.
Split into simpler sentences: The standard 6 pounder shot was effective frontally only at short ranges and only at limited angles and in case of the Panther only able to penetrate the turret. But it was still effective against them from other angles at longer ranges.