Complex sentence: When the Whig Party disintegrated after the election of 1852, some Whigs flocked to the short-lived Know-Nothing Party, butr Stephens fiercely opposed the Know-Nothings both for their secrecy and their anti-immigrant and anti-Catholic position.
Split into simpler sentences: When the Whig Party disintegrated after the election of 1852, some Whigs flocked to the short-lived Know-Nothing Party. But Stephens fiercely opposed the Know-Nothings both for their secrecy and their anti-immigrant and anti-Catholic position.