Complex sentence: The expression "Indo-Greek Kingdom" loosely describes a number of various dynastic polities, traditionally associated with a number of regional capitals like Taxila, Mortimer Wheeler "Flames over Persepolis" (London, 1968).
Split into simpler sentences: The expression "Indo-Greek Kingdom" loosely describes a number of various dynastic polities. There were numerous cities, such as Taxila, Mortimer Wheeler "Flames over Persepolis" (London, 1968).