Complex sentence: Smashing rice-eating crabs in rice paddies, splashing juices containing metacercariae, can also transmit the parasite, or using juices strained from fresh crabs to medicinal uses.
Split into simpler sentences: Smashing rice-eating crabs in rice paddies, splashing juices containing metacercariae, can also transmit the parasite. Or using juices strained from fresh crabs to medicinal uses.