Here's a good example of a bill from last year that went round and round and round.
Not sure we can describe it in plain language, but you can at least follow all the steps it went through:
http://leg1.state.va.us/cgi-bin/legp504.exe?121+sum+HB375
This was the parking lot bill.
I took a shot... this was a good example, it went through just about every change there is!
House:
Initial filing
Referred to committee and sub-committee
Passed out of both
Full House vote (twice)
Amended on floor
Full House vote third time.
Senate:
Referred to committee
Reported with substitute
Full Senate rejected committee substitute
Floor substitute - agreed to
Passed full Senate
House:
Full House rejected Senate substitute
Senate:
Full Senate insisted on substitute
Senate requests conference committee
House agrees to conference committee
Senate/House: both appoint members to committee
From here it's confusing, looks like Senate agreed, House substituted?
Bill passed House and Senate as HB375ER
Signed by both leaders.
Governor returns with recommendation
House and Senate both concur on Governor's recommendation
Signed again by both leaders, and finally Governor.