Complex sentence: InfoPath Forms Services (or Office Forms Services) is a component of Microsoft Office SharePoint Server 2007 (Enterprise version only) which allows Microsoft Office InfoPath forms to be hosted in a SharePoint web site and serve them using a browser based interface.
Split into simpler sentences: InfoPath Forms Services (or Office Forms Services) was introduced as a component of Microsoft Office SharePoint Server 2007 (Enterprise version only). The services allow Microsoft Office InfoPath forms to be hosted in a SharePoint web site and served using a browser-based interface.