Complex sentence: In 2010 WHERE launched a Check-in feature on iPhone and Android versions of WHERE that allows users to announce when they enter a location--be it a restaurant or other business-and then broadcast this information to their friends and followers on Facebook and Twitter.
Split into simpler sentences: In 2010 WHERE launched a Check-in feature on Android and iPhone versions of WHERE. It allows users to announce when they enter a location, be it a restaurant or other business, and then broadcast this information to their friends and followers on Facebook and Twitter.