Complex sentence: Dredge had a interest in the various international exhibitions held both in the UK and abroad, and authored several works on them, notably on the Vienna Universal Exhibition (1873) with Maw and Alexander Kennedy, as well as the Paris International Exhibition (1878).
Split into simpler sentences: Dredge had a interest in the various international exhibitions held both in the UK and abroad. He authored several works on them, notably on the Vienna Universal Exhibition (1873) with Maw and Alexander Kennedy, as well as the Paris International Exhibition (1878).