Complex sentence: Haast accompanied Hochstetter on his journey to Drury a few days later and also present on the trip were several of Hochstetter's fellow scientists as well as the explorer and surveyor Charles Heaphy.
Split into simpler sentences: Haast accompanied Hochstetter on his journey to Drury a few days later. Also present on the trip were several of Hochstetter's fellow scientists as well as the explorer and surveyor Charles Heaphy.