分清 is a resultative verb compound (动结式) made from 分 'to separate' and 清 'clear'. It means 'to distinguish clearly' or 'to tell apart'. As a separable verb (离合词), you can insert 得 or 不 between 分 and 清 to express possibility or impossibility: 分得清 ('can distinguish') and 分不清 ('cannot distinguish'). The object usually follows the whole compound, or you can place it between the two parts in question patterns.