Complex sentence: The tetradrachm was a silver coin issued by various Greek mints from 600BE to 200AD when the area was under Roman rule, this also extended to Greek influenced areas of Iran and India until the 6th century.
Split into simpler sentences: The tetradrachm was a silver coin issued by various Greek mints from 600 BE to 200 AD when the area was under Roman rule. The currency's use also extended to Greek-influenced areas of present-day Iran and India until the 6th century.