[SixOfSpades]

Both Ranger/Clerics and Ranger->Clerics (that's my shorthand for the difference between Multiclassing & Dualclassing) are major cheese factories. The Cleric->Ranger is usually less so, however.

A lot of the decisions that the game engine makes are based on whether the character involved is of a certain class. Level is irrelevant--even if the character only has 1 or 2 levels of a certain class, it still counts.

If the character's "Thief" flag is True (example: Nalia), they can use Long Swords.
If the character's "Fighter" flag is True (example: Anomen), they can use Potions of Heroism.
If the character's "Mage" flag is True, they can wear Mage Robes.

And now the relevant bit:
If the character's "Ranger" flag is True, they gain access to the Druid half of the Priest scroll.
If the character's "Cleric" flag is True, they gain access to the Cleric half of the Priest scroll.
These attributes are cumulative, and the game compares the spellslots granted by your Ranger half with the spellslots granted by your Cleric half, and gives you whichever one is higher.