Complex sentence: In 1998, Clinton was impeached by the House of Representatives for perjury before a grand jury and obstruction of justice during a lawsuit against him, both related to a scandal involving White House (and later Department of Defense) employee Monica Lewinsky.
Split into simpler sentences: In 1998, Clinton was impeached by the House of Representatives for committing perjury while testifying before a grand jury and also for obstruction of justice during a lawsuit that was filed against him. Both issues were related to a scandal that involved White House (and later Department of Defense) employee Monica Lewinsky.