You don't have to put your conditions into the condition field.
You can put it all on the first line of your business rule:
Condition: <blank>
Script:
if(<all the long conditions go here> == 1) {
//rest of script
}
This isn't the best because the BR will run always, so what I've done with long conditions is break the important ones out into the condition field, and the less important ones into an if statement on the first line of the script:
Condition: current.field == 1 && current.whatever != 7
Script:
if(<less important condition> > 0) {
//rest of script
}
