Complex sentence: Through Sol's (a knowledgeable man in fighting himself) training Sin has grown into a very strong child-even being able to harness the power of a reddish lightning magic like his father (whose lightning is blue).
Split into simpler sentences: Through Sol's (a knowledgeable man in fighting himself) training Sin has grown into a very strong child. Even being able to harness the power of a reddish lightning magic like his father (whose lightning is blue).