Complex sentence: He was a British All-Styles Karate Team Member from 1970 to 1973; from 1974 to 1977 he had won several full contact and kick-boxing titles in Japan and the USA.
Split into simpler sentences: He was a British All-Styles Karate Team Member from 1970 to 1973. During 1974 to 1977 he won several full contact and kick-boxing titles in Japan and the USA.