Complex sentence: Since December 16,2010, she is Parliamentary group leader of the GreenLeft party in the Dutch House of Representatives, replacing Femke Halsema who announced her retirement from politics as of that date.
Split into simpler sentences: Since December 16,2010, she is the leader of the GreenLeft party in the Dutch House of Representatives. She replaces Femke Halsema who announced her retirement from politics as of that date.