2 of 4 added 195 characters in body

Forte, 73 69 Bytes.

Golfed it a bit more

2LET1=3:PUT34
4PUT34:PUT59
1PRINT"2LET1=3:PUT34
4PUT34:PUT59
1PRINT";

Kinda Explained

2LET1=6             //  Line 2, Set 6 to 1. Which means what -was- line 1, now is line 6.
2LET1=3:PUT34           // Line 2, Set 1 to 3, then put a "
4PUT34:PUT59            // Line 4, Put a ", then a ;
1PRINT"2LET1=4:PUT34    // Line 1, Print the first half of the script.
4PUT34:PUT59            // 
1PRINT";                // Line to sets 1 to 3, which means, even though 1 has been executed already, it's now "Line 3, Print the first half of the script" which means it's printed again.

Or, in order...

1. Print the left half of the script.
2. Set the Line of Line 1 to Line 3, then print a "
3. Print the left half of the script.
4. Print a ", then a ;

Try it online!