Complex sentence: In his youth he was regarded as a very handsome and dashing young man, much sought after by his female contemporaries who thought him adorable, but Bertie, an adventurous young man, eschewed marriage in favour of exploration and foreign travel.
Split into simpler sentences: In his youth he was regarded as a very handsome and dashing young man, much sought after by his female contemporaries who thought him adorable. But Bertie was a young man for adventure and eschewed marriage in favour of exploration and foreign travel.