Complex sentence: Some years later Heiko explored many new, unresearched areas in South America travelling monthly into the most remote places, and by 1967 he moved his company Aquarium Rio to Frankfurt am Main, Germany, returning monthly to Brazil and South America to collect.
Split into simpler sentences: Some years later, Heiko explored many new, unresearched areas in South America, travelling monthly into the most remote places. By 1967, he moved his company Aquarium Rio to Frankfurt am Main, Germany, returning monthly to Brazil and South America to collect.