Complex sentence: In modern times, following the obsolescence of such heavy troops, all infantry and combat vehicles has become indistinguishable from skirmishers, and the term has lost military meaning: today, a battle with only light, indecisive combat is often called a skirmish.
Split into simpler sentences: In modern times, following the obsolescence of such heavy troops, all infantry has become indistinguishable from skirmishers, and the term has lost military meaning. A battle with only light, indecisive combat is often called a skirmish.