Complex sentence: There are currently four options proposed by different parties for currency if Scotland were to become an independent state; changing to the euro, retaining pound sterling with or without a currency union, or adopting a separate Scottish currency.
Split into simpler sentences: There are currently four options proposed by different parties for currency if Scotland were to become an independent state. Switching to the Euro, retaining Pound Sterling with or without a currency union, or adopting a separate Scottish Currency.