Complex sentence: Browne was elected a fellow of the Society of Antiquaries in 1752 (though he resigned in 1772) and then travelled to Florence and Rome between 1753 and 1754.
Split into simpler sentences: Browne was elected a fellow of the Society of Antiquaries in 1752 (though he resigned in 1772). He travelled to Florence and Rome between 1753 and 1754.