Complex sentence: Jefferson was sworn in by Chief Justice John Marshall at the new Capitol in Washington DC on March 4,1801; at the time partisan strife between the Democratic-Republican and Federalist parties had grown to new levels.
Split into simpler sentences: Jefferson was sworn in by Chief Justice John Marshall at the new Capitol in Washington DC on March 4,1801. Nevertheless, at the time partisan strife between the Democratic-Republican and Federalist parties had grown to new levels.