Who returned?
Rashi: Melech Romi returned to his land from Melech ha'Negev.
Malbim: Antiyochus returned. In Yerushalayim they heard that he died. Antiyochus had deposed the Kohen Gadol and appointed a second in place of him. The first wanted to expel the latter and return to his status; for this, Antiyochus considered them to be rebelling.
What do we learn from "u'Levavo Al Bris Kodesh"?
Rashi: He wanted to annul his Bris with Yisrael. Malbim – and do evil to them.
Ibn Ezra: He wanted to annul the Bris between Malchus Aram and Yehudah ben Chashmona'im.
Why does it say "v'Asah"?
Rashi: He succeeded to return to his land.
Malbim: He killed many Yisrael, and then returned to his land.
