Complex sentence: Despite initial reluctance, he gradually allows Hiccup more responsibility and becomes more open to his suggestions and beliefs and as the series progresses, Stoick is often found more in favour of dragons on Berk.
Split into simpler sentences: Despite initial reluctance, he gradually allows Hiccup more responsibility and becomes more open to his suggestions and beliefs. As the series progresses, Stoick is often found more in favour of Dragons on Berk.