Complex sentence: On the 25th of August a Anglo-Polish military alliance was signed at a first glance this treaty was just a catch all mutual assistance pact against the aggression of any other European nation however a secret protocol attached to the agreement made clear this was Germany.
Split into simpler sentences: On the 25th of August a Anglo-Polish military alliance was signed. At a first glance this treaty was just a catch all mutual assistance pact against the aggression of any other European nation however a secret protocol attached to the agreement made clear this was Germany.