Isaiah 53:9

9 They intended to bury him with criminals,
Heb “one assigned his grave with criminals.” The subject of the singular is impersonal; English typically uses “they” in such constructions.

but he ended up in a rich man’s tomb,
This line reads literally, “and with the rich in his death.” בְּמֹתָיו (bemotayv) combines a preposition, a plural form of the noun מוֹת (mot), and a third masculine singular suffix. The plural of the noun is problematic and the יו may be the result of virtual dittography. The form should probably be emended to בָּמָתוֹ (bamato, singular noun). The relationship between this line and the preceding one is uncertain. The parallelism appears to be synonymous (note “his grave” and “in his death”), but “criminals” and “the rich” hardly make a compatible pair in this context, for they would not be buried in the same kind of tomb. Some emend עָשִׁיר (’ashir, “rich”) to עָשֵׂי רָע (’ase ra’, “doers of evil”) but the absence of the ayin (ע) is not readily explained in this graphic environment. Others suggest an emendation to שְׂעִירִים (seirim, “he-goats, demons”), but the meaning in this case is not entirely transparent and the proposal assumes that the form suffered from both transposition and the inexplicable loss of a final mem. Still others relate עָשִׁיר (’ashir) to an alleged Arabic cognate meaning “mob.” See HALOT 896 s.v. עָשִׁיר. Perhaps the parallelism is antithetical, rather than synonymous. In this case, the point is made that the servant’s burial in a rich man’s tomb, in contrast to a criminal’s burial, was appropriate, for he had done nothing wrong.

because
If the second line is antithetical, then עַל (’al) is probably causal here, explaining why the servant was buried in a rich man’s tomb, rather than that of criminal. If the first two lines are synonymous, then עַל is probably concessive: “even though….”
he had committed no violent deeds,
nor had he spoken deceitfully.
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