Complex sentence: The loss of Hari Singh Nalwa proved a major blow to the Sikh Army and the subsequent year June 1839 death of Ranjit Singh plunged the kingdom into dynastic conflict and British fought 2 wars to defeat and dissolve the Sikh Empire.
Split into simpler sentences: The loss of Hari Singh Nalwa proved a major blow to the Sikh Army. The British eventually fought 2 wars to defeat and dissolve the Sikh Empire.