Complex sentence: Zouche attempted to gain favour with the King by serving in the French campaign of 1492, but his financial situation continued to suffer: his position was considered insufficient for the status of a nobleman and he suffered the humiliation of being styled a mere knight.
Split into simpler sentences: Zouche attempted to gain favour with the King by serving in the French campaign of 1492, but without evident success. His financial situation continued to suffer: his position was considered insufficient for the status of a nobleman and he suffered the humiliation of being styled a mere knight.