Malaysia 1978 The mainland part of Malaysia I have only visited once and that was for about 1012 days but on two other jouneys I have been to Sabah and Sarawak on Borneo look under territories

What is the correctly punctuated version of this sentence?
Malaysia 1978. The mainland part of Malaysia I have only visited once and that was for about 10-12 days, but on two other jouneys I have been to Sabah and Sarawak on Borneo (look under territories).