Complex sentence: She graduated in 1991 from Trinity College, Cambridge with a B.A. in economics, and joined the bank J.P. Morgan & Co. after completing a number of internships there while still a student.
Split into simpler sentences: She graduated in 1991 from Trinity College, Cambridge with a B.A. in economics. She joined the bank J.P. Morgan & Co. directly from university after completing a number of internships there while still a student.