Complex sentence: Hogg had gained a reputation as a Greek scholar however, and contributed to the "Encyclopædia Britannica"; he was the author of the "Alphabet" and "Antiquities" entries in the seventh edition.
Split into simpler sentences: Hogg had gained a reputation as a Greek scholar, however, and even contributed to the "Encyclopædia Britannica". He wrote the "Alphabet" and "Antiquities" entries in the seventh edition.