Complex sentence: As with many river fish, the best conditions for chub fishing are when the water is "carrying colour", when the clarity of the water has been temporary clouded by mud washing into the river, often following heavy rainfall.
Split into simpler sentences: As with many river fish, the best conditions for Chub fishing are when the water is "carrying colour". This means that the clarity of the water has been temporary clouded by mud washing into the river, often following heavy rainfall.