Complex sentence: By the time the First World War broke out, the battery had been re-equipped with six quick-firing 13 pounders and was stationed at Meerut, still assigned to XII Brigade with W Battery and assigned to the 7th (Meerut) Division.
Split into simpler sentences: By the time the First World War broke out, the battery had been re-equipped with six quick-firing 13 pounders. It was still with W Battery in XII Brigade, and was stationed at Meerut, assigned to the 7th (Meerut) Division.