This phrase contains the word ewéte, which means *nothing*, and breaks down in the following way:

Ewéte+el slhq'él:exw (....which blends into: Ewétal slhq'él:exw)

nothing+my knowledge (of it)

="I don't know (it)"

*El* is a shortened form of *tel* (my). When *ewéte* and *el* combine, this blends into *ewétal*