The surah contains 'ayat (plural of 'ayah = sign) usually translated as 'verses.' It is not a good translation because "verse" is associated with poetry while the Quran is not a poetry. However, I will use this word because it is now commonly understood. An 'ayah is not necessarily a complete sentence.

Sometimes one complete surah, sometimes one or more ayat were revealed, according to the need. The occasion or event connected with the revelation of a certain verse has some bearing on the understanding of its meaning and implications, but the verse is not confined to that event in its application.

There are 114 surahs in the Quran; the longest of them is al-Baqarah with 286 'ayat and covering about 1/12 of the volume; and the shortest is al-Kawthar with four 'ayat which may be written in one line.

As for the 'ayat, there are 6236 'ayat, as described in al-Mu'jam al-Ihsá'i by Dr. Mahmud Ruhani.

The Muslims have divided the Quran into 30 equal parts (juz' in Arabic and para in Urdu), to enable the readers to recite the whole Book once in a month, specially during the holy month of Ramadan.

They have also divided the surahs into various sections of 'ayat - these sections are called ruku' one ruku' contains 7 to 12 'ayat. For example, surah al-Fatihah (the 1st surah) has 7 'ayat, all grouped in one ruku'; the 2nd surah has 286 'ayat divided into 40 ruku's.