Complex sentence: As soon as the general Carlos Arana Osorio took office on 1 July 1970, he reopened the case and began working in for EXMIBAL to get a concession; however, many social sectors opposed to it, arguing that it would be too costly for the country.
Split into simpler sentences: As soon as the general Carlos Arana Osorio took office on 1 July 1970, he reopened the case and began working in for EXMIBAL to get a concession. However, many social sectors opposed to it, arguing that it would be too costly for the country.