Complex sentence: The SDM is not meant to be a squad sniper who engages the enemy with precision fire at extreme ranges, but instead is trained to directly support the squad with well-aimed shots at ranges slightly beyond the normal engagement distances for riflemen.
Split into simpler sentences: The SDM is not meant to be a squad sniper that engages with precision fire at extreme ranges. Instead, the soldier is trained to directly support the squad with well-aimed shots at ranges slightly beyond the normal engagement distances for riflemen.