Complex sentence: He took three motorised sled/tractors and Siberian ponies as well, the advantage the motorised sleds provided was swiftly nullified however, when the largest of the sleds fell through thin ice into the sea.
Split into simpler sentences: He took three motorised sled/tractors and Siberian ponies as well. The advantage the motorised sleds provided was swiftly nullified however, when the largest of the sleds fell through thin ice into the sea.