Complex sentence: The washing, fortunately for us, was not complete: that's how earlier texts can be seen using ultraviolet light underneath newer texts, or the standardization of the Qur'anic text by' Uthmān may have led to the non-standard lower text becoming obsolete.
Split into simpler sentences: The washing, fortunately for us, was not complete: that's how earlier texts can be seen using ultraviolet light underneath newer texts. Or the standardization of the Qur'anic text by' Uthmān may have led to the non-standard lower text becoming obsolete.