The column is probably a CLOB or LONG datatype.
SET LONG 10000 to the top of your .sql script.
The number can be adjusted, but I believe there is a limit.
You may also want to increase your line size with
300 (whatever size works for you).
You also should trim trailing blanks.
SET TRIMOUT ON trims trailing blanks from screen
SET TRIMSPOOL ON trims trailing blanks from spooled