Complex sentence: In the autumn of 2000, Jeremy was hired by Bank of America, where he managed portfolios of distressed debt and merger arbitrage securities under the asset management of Jonathan Sandelman, who later founded Sandelman Partners.
Split into simpler sentences: In the autumn of 2000, Jeremy was hired by Bank of America, where he managed portfolios of distressed debt and merger arbitrage securities. Under the Asset management, of Jonathan Sandelman, who later founded Sandelman Partners.