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Lil allows line-breaks pretty much anywhere, except inside comments (the comment always ends at the end of the line). Here’s your example, broken over lines:

list(
 list(1,1,1,1,1,1,1,1),
 list(1,0,0,0,0,0,0,1),
 list(1,0,0,0,0,0,0,1),
 list(1,0,0,0,0,0,0,1),
 list(1,0,0,0,0,0,0,1),
 list(1,0,0,0,0,0,0,1),
 list(1,1,1,1,1,1,1,1)
)

It doesn’t quite do what you want, though. Instead of making an eight-item list of eight-item lists, it makes a nine-element list where the first eight items are tile numbers, and the ninth item is a nine-element list where the first eight items are tile numbers, and the ninth item is a nine-element list…

You want something more like this:

(list 1,1,1,1,1,1,1,1),
(list 1,0,0,0,0,0,0,1),
(list 1,0,0,0,0,0,0,1),
(list 1,0,0,0,0,0,0,1),
(list 1,0,0,0,0,0,0,1),
(list 1,0,0,0,0,0,0,1),
 list 1,1,1,1,1,1,1,1

Because Lil expressions are evaluated from right to left, this starts by stringing some 1s together to make an eight-element list representing the bottom row, then makes a one-element list wrapping the bottom-row list, then joins that wrapper with the one wrapping the second-bottom row, etc.

That will definitely work, but another thing you might consider is representing the tile map with an image. It is also a rectangular array of numbers, but stored more efficiently. It can also be easier to edit - .paste[] the image onto the background of a card, and you can use Decker’s built-in editing tools to draw the level, then .copy[] it back. Or better yet, if you have a card to store each level’s data, put the tilemap on the background image, and add a “Show: None” field named bounds to mark the bounds of the tilemap within the card. If the card representing the level you want to load is called level, you can get the tilemap with level.image.copy[level.widgets.bounds.pos level.widgets.bounds.size].