Complex sentence: Through a program of intensive program of active patrolling and tracking, surveillance, blocking and other security operations, the battalion came to dominate the western border regions, however, during May and June there were a number of attacks on 6 RAR's positions.
Split into simpler sentences: Through a program of intensive active patrolling and tracking, surveillance, blocking and other security operations the battalion came to dominate the western border regions. However, during May and June there were a number of attacks on 6 RAR's positions.