Complex sentence: In May 2002 Irssi's autoconf "configure" script was found to have been backdoored for two months, the binary was never backdoored-only the script, and the problem was immediately fixed.
Split into simpler sentences: In May 2002 Irssi's autoconf "configure" script was found to have been backdoored for at least two months. However, the binary was never backdoored-only the script, and the problem was immediately fixed.