Complex sentence: In June 1944, the 4th Battalion of the Del Pilar Regiment was established under the leadership of Major Francisco del Rosario, they continued fighting until the returned of the USAFFE under the leadership of Gen. Douglas MacArthur.
Split into simpler sentences: In June 1944, the 4th Battalion of the Del Pilar Regiment was established under the leadership of Major Francisco del Rosario. They continued fighting until the returned of the USAFFE under the leadership of Gen. Douglas MacArthur.