Morphology of "antidisestablishmentarianism",

an unusually long English word which means opposition to the separation of Church and State, especially in England.

According to Wiktionary,
antidisestablishmentarianism < anti- +‎ disestablishmentarian +‎ -ism.

The morphology is ambiguous, i.e., we could draw different trees. We could have either

antidisestablishmentarianism < anti- +‎ disestablishmentarianism
disestablishmentarianism < disestablishmentarian +‎ -ism
disestablishmentarian < disestablishment +‎ -arian

or

antidisestablishmentarianism < antidisestablishmentarian +‎ -ism
antidisestablishmentarian < anti- +‎ disestablishment +‎ -arian,

with another ambiguity. We could have either

antidisestablishmentarian < antidisestablishment +‎ -arian
antidisestablishment < anti- +‎ disestablishment

or

antidisestablishmentarian < anti- +‎ disestablishmentarian,
disestablishmentarian < disestablishment +‎ -arian.

According to Wiktionary, the rest of the morphology is unambiguous:

disestablishment < dis- +‎ establishment
establishment < establish + -ment,

but a possible alternative is

disestablishment < disestablish + -ment
disestablish < dis- +‎ establish.

The word is only slightly bastardized. Most of the roots are Latin, but the first and last are Greek:

anti- < Ancient Greek ἀντι-, and

-ism < Ancient Greek -ισμός or -ισμα.