All he means is you can group them.

For example:

on *:TEXT:!trigger*:#:{

Is the same as:

on *:TEXT:*:#: {
 if ($1 == !trigger) {
 }
}

By doing that, you can put multiple commands in one event:

on *:TEXT:*:#: {
 if ($1 == !trigger) {
 }
 if ($1 == !trigger2) {
 }
}