15:26a And he did evil in the sight of the LORD

He did what was wrong in the sight of Yahweh
-or-
Yahweh saw that his deeds/actions were evil.
-or-
Nadab acted in a way that displeased Yahweh.

15:26b and walked in the way of his father

and copied/imitated the ⌊bad⌋ ways/example of his father.
-or-
Nadab acted just like his father ⌊Jeroboam⌋ had.
-or-
For he ⌊sinned⌋ just like his father ⌊Jeroboam⌋ ⌊had sinned⌋.

15:26c and in his sin, which he had caused Israel to commit.

He sinned in the same way in which his father had led the people of Israel to sin.
-or-
He continued committing the sins that his father Jeroboam had encouraged Israel to commit.
-or-
Jeroboam had caused the people of Israel to sin against God, and Nadab sinned against God in the same way that they had sinned.

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