Here's part of Mickey Kaus's Handy U-Print-It Pocket Guide: Why S.744?s a Fraud

"Multiple triggers"
Legalization is immediate. DHS just has to write border "plan." The most any "triggers" can possibly do is delay green cards and citizenship. 

"90 % effectiveness"
If not reached, triggers only toothless commission 

"Pay back taxes"
Only if already "assessed" by IRS (unlikely). Newly legalized may instead get
refunds.

"Learn English"
Only need to sign up for English class. 

"Clean record"
Allows two free misdemeanors. Additional misdemeanors (including assaults) can be waived by DHS. 

No "public charge." Must earn 125% of poverty line
They're going to deport people who earn only 124% or less? Ha.

Read the whole thing there.

Basically, the symbolic point of the bill, which will determine how it's interpreted and enforced, is that deporting illegal aliens is evil and illegitimate.