Complex sentence: However, a Mataram spy in Tuban deceived the allied forces into taking a bad coastal route to Pajang, and the allied army found itself isolated in Siwalan, near Pajang.
Split into simpler sentences: However, a Mataram spy in Tuban deceived the allied forces into taking a bad coastal route to Pajang. As a result, the allied army found itself isolated in Siwalan, near Pajang.