Complex sentence: Over the last twenty years, the work of Peter Fensham, the noted Australian science educator, is considered to have heavily contributed to reforms in science education, that included giving greater prominence to STS in the curriculum (Aikenhead, 2003).
Split into simpler sentences: Over the last twenty years, the work of Peter Fensham, the noted Australian science educator, is considered to have heavily contributed to reforms in science education. Fensham's efforts included giving greater prominence to STS in the school science curriculum (Aikenhead, 2003).