Fix grammaticality of the sentence: Thereafter, multiple WSNs can interoperated in order to attend single or multiple applications, and sensings activity can be provided as service for users, allowed them to acquire/purchased services on demand \citeAlamri2013.
Thereafter, multiple WSN's can interoperate in order to attend single or multiple applications, and sensing activities can be provided as services for users, allowing them to acquire/purchase services on demand \cite.