Schedules.
Here's a example
schedule(0, 0, "newChatHud_addline", "\c6Hello there!");
schedule(2000, 0, "newChatHud_addline", "\c6I'm stealing your Blockland Key.");
schedule(3000, 0, "newChatHud_addline", "\c6By");
schedule(4000, 0, "newChatHud_addline", "\c6each");
schedule(5000, 0, "newChatHud_addline", "\c6second.");
So basically, what schedule is:
schedule(TIMEINMILLISECONDS, OBJECT (USUALLY 0 FOR NONE), COMMAND, PARAMETER1, PARAMETER2, PARAMETER3, ...);