Complex sentence: Externally, it looks somewhat like the M60E3, but it has many internal changes and improvements that modernize the effectiveness and reliability of this weapon, in general it is a more reliable weapon than all previous M60s.
Split into simpler sentences: Externally, it looks somewhat like the M60E3, but it has many internal changes and improvements that modernize the effectiveness and reliability of this weapon. In general it is a more reliable weapon than all previous M60s.