Complex sentence: Further investigation led to charges of perjury and led to the impeachment of President Clinton in 1998 by the U.S. House of Representatives and his subsequent acquittal on all impeachment charges of perjury and obstruction of justice in a 21-day Senate trial.
Split into simpler sentences: Further investigation led to charges of perjury and to the impeachment of President Clinton in 1998 by the U.S. House of Representatives. He was subsequently acquitted on all impeachment charges of perjury and obstruction of justice in a 21-day Senate trial.