Original sentence: However, such positions are rarely adopted.The relations between these two questions mean that on the whole Presentists are also endurantists and Eternalists are also perdurantists (and vice versa), but this is not a necessary connection and it is possible to claim, for instance, that time's passage indicates a series of ordered realities, but that objects within these realities somehow exist outside of the reality as a whole, even though the realities as wholes are not related
Edited sentence: However, such positions are hard to defend and rarely adopted.The relations between these two questions mean that on the whole presentists are also endurantists and eternalists are perdurantists and vice versa, but this is not necessary and it is possible to claim, for instance, that time's passage indicates a series of ordered realities, but that objects within these realities somehow exist outside of the reality as a whole, even though the realities as wholes are not related