The code in my second message actually already does what you describe: it presents the sentence “Today is a very nice day!” as a whole chunk, and the second sentence word-by-word
This is actually how the DashedSentence controller works by default in Ibex: if you take a close look at the s parameter, the first time it is an array of one element (that element being the string) whereas the second time it is a string, directly (no square brackets). When the parameter is an array, every element is presented as a chunk, but when the parameter is directly a string, it is split using the space character and each word (separated by a space) is a chunk.
Jeremy