Complex sentence: By establishing dealerships with wireless carriers overseas, Telestial was able to offer travelers a local cell phone service at local rates with a local cell phone number as an alternative to an expensive phone rental and later, convenient but expensive international roaming.
Split into simpler sentences: By establishing dealerships with wireless carriers overseas, Telestial was able to offer travelers a local cell phone service at local rates. Telestial is an alternative to an expensive phone rental and convenient but expensive international roaming.