Complex sentence: The GRC was absorbed by three GRCs in the 2001 general election, namely, Ang Mo Kio GRC, Pasir Ris-Punggol GRC and Aljunied GRC due to redrawing of electoral districts by the Elections Department.
Split into simpler sentences: The GRC was absorbed into three GRCs in the 2001 general election. The GRCs which absorbed Cheng San GRC were Ang Mo Kio GRC, Pasir Ris-Punggol GRC and Aljunied GRC due to redrawing of electoral districts by the Elections Department.