Complex sentence: In Liberia, the True Whig Party--named in direct emulation of the American Whig party, was founded in 1869 and it dominated politics in that country from 1878 until 1980.
Split into simpler sentences: In Liberia, the True Whig Party--named in direct emulation of the American Whig party, was founded in 1869. It dominated politics in that country from 1878 until 1980.