Complex sentence: The supply of drinking water in an urban-setting emergency has been improved by the introduction of standardised, rapid deployment kits; however, the provision of sanitation programmes is more challenging as it provides a limited choice of technologies.
Split into simpler sentences: The supply of drinking water in an urban-setting emergency has been improved by the coming in of the standardised, rapid deployment kits. However, the provision of sanitation programmes is more challenging as it provides a limited choice of technologies.