Components in this compound:

te

3rd conversion; switch 1st/3rd places.

ke

start grouping of tanru, etc; ... type of ... ; overrides normal tanru left grouping.

se

2nd conversion; switch 1st/2nd places.

du'u

abstractor: predication/bridi abstractor; x₁ is predication [bridi] expressed in sentence x₂.

te

3rd conversion; switch 1st/3rd places.

bangu

x₁ is a/the language/dialect used by x₂ to express/communicate x₃ (si'o/du'u, not quote).