Complex sentence: During this work a temporary footbridge was installed at the northern end of the platforms and in order to access platforms from the main entrance passengers were required to use the permanent staircase to Platform 1 and walk the length of the platform to the temporary footbridge.
Split into simpler sentences: During this work a temporary footbridge was installed at the northern end of the platforms. In order to access platforms from the main entrance passengers had to use the permanent staircase to Platform 1 and walk the length of the platform to the temporary footbridge.