Simplify the following text for a Grade 11 native English-speaking person.
Original: The Goldman Sachs Group , Inc. is an American investment banking and securities firm that engages in global investment banking , securities , investment management , and other financial services primarily with institutional clients .
Simplified: The Goldman Sachs Group , Inc. , or just Goldman Sachs is a investment banking and securities firm . They are involved with global investment banking , securities , investment management , and other financial services primarily with institutional clients .