“Yahweh had visited his people.” Yahweh had intervened and blessed the people. How did God “visit”? Not by a personal presence of some kind, but rather by giving them bread, which the people understood as being from God. [For more on God “visiting,” see commentary on Exod. 20:5].
“bread.” A common idiom for food. “Bread” came to be used by metonymy for food in general because bread was the main food in the culture and staple of life. Bread was indeed the staff upon which the people leaned for food, and in literature it is sometimes referred to as the “staff of life” (cp. Lev. 26:26; Ps. 105:16; Ezek. 4:16; 5:16).