Complex sentence: The basic subscription plan allowed access to the service on three devices for US $9.99 per month, or US $99.99 per year; alongside a web-based interface, apps were available for Android, iOS, and Windows Phone.
Split into simpler sentences: The basic subscription plan allowed access to the service on three devices for US $9.99 per month, or US $99.99 per year. Along with a web-based interface, apps were available for Android, iOS, and Windows Phone.