Simplify the following text for a Grade 15 native English-speaking person.
Original: In response to the demand for business-grade IM and the need to ensure security and legal compliance , a new type of instant messaging , called `` Enterprise Instant Messaging '' ( `` EIM '' ) was created when Lotus Software launched IBM Lotus Sametime in 1998 .
Simplified: In response to the demand for business-grade IM and the need to ensure security and legal compliance , a new type of instant messaging , called `` Enterprise Instant Messaging '' ( `` EIM '' ) was created when Lotus Software launched Lotus Sametime in 1999 .