poetic effect of segmentation of a group of words

Some poems break a sentence or a clause into two lines at the middle of one meaning group of words, like -

... a blue
sky and ...

What effect such an irregular line break has?

Mr. Garrison Keillor usually ignores such line breaks when reading poems in the Writer's Almanac radio program.

Solution 1:

I think the term you're looking for here is

enjambment (n)
The continuation of a syntactic unit from one line or couplet of a poem to the next with no pause.

[TFD, American Heritage Dictionary]

Solution 2:

To take a
normal prose sentence and
make it look like
poetry,
all one needs do is
break the lines in
unusual places.
We are too easily
deceived.