Simplify the following text for a Grade 23 native English-speaking person.
Original: There have been several attempts to create a unified standard for instant messaging : IETF 's SIP ( Session Initiation Protocol ) and SIMPLE ( SIP for Instant Messaging and Presence Leveraging Extensions ) , APEX ( Application Exchange ) , Prim ( Presence and Instant Messaging Protocol ) , the open XML-based XMPP ( Extensible Messaging and Presence Protocol ) , more commonly known as Jabber and OMA 's ( Open Mobile Alliance ) IMPS ( Instant Messaging and Presence Service ) created specifically for mobile devices .
Simplified: There have been several attempts to create a unified standard for instant messaging : IETF 's SIP ( Session Initiation Protocol ) and SIMPLE ( SIP for Instant Messaging and Presence Leveraging Extensions ) , APEX ( Application Exchange ) , Prim ( Presence and Instant Messaging Protocol ) , the open XML-based XMPP ( Extensible Messaging and Presence Protocol ) , and Open Mobile Alliance 's Instant Messaging and Presence Service developed specifically for mobile devices .