Complex sentence: The mass destructions in Bucharest began in 1983 and continued up until late 1988, being very intense within the first year, so that in June 1984 the Ceauşescus could inaugurate the workings of what would become the House of the People.
Split into simpler sentences: The mass destructions in Bucharest began in 1983 and continued up until late 1988. Construction was very intense during the first year, so that in June 1984 the Ceauşescus could inaugurate the workings of what would become the House of the People.