Complex sentence: The Mughals could not cross through the deep 10 ft moat surrounding the Bijapur Fort and the 50 ft high 25 ft wide fine granite and lime mortar walls were almost impossible to breach.
Split into simpler sentences: The Mughals could not cross through the deep 10-ft moat surrounding Bijapur Fort. Moreover, the 50-ft high 25-ft wide fine granite and lime mortar walls were almost impossible to breach.