Complex sentence: It can be cultivated in deep, stone-free soils and is attacked by the carrot fly and other insect pests, viruses and fungal diseases, of which canker is the most serious.
Split into simpler sentences: It can be cultivated in deep, stone-free soils. It is attacked by the carrot fly and other insect pests, viruses and fungal diseases, of which canker is the most serious.