Complex sentence: The "hôtel particulier" is an example of French Renaissance architecture; this, coupled with its ornamentation, were intended to reflect the tastes of Robertet, who was well known for his artistic collections.
Split into simpler sentences: The "hôtel particulier" is an example of French Renaissance architecture. Its architecture and ornamentation were intended to reflect the tastes of Robertet, who was well known for his artistic collections.