Complex sentence: In 1576 Tommaso Ghinucci, a Siennese architect oversaw the enlargement of the suburbs of what was now becoming a small town, these changes today are most obvious in the vicinity of the Piazza 20th Settembre, inspired by Piazza del Popolo in Rome.
Split into simpler sentences: In 1576 Tommaso Ghinucci, a Siennese architect oversaw the enlargement of the suburbs of what was now becoming a small town. These changes today are most obvious in the vicinity of the Piazza 20th Settembre, inspired by Piazza del Popolo in Rome.