ESP8266 Internal ADC
Step by step ADC input - voltage divider - the easy way example
ADC input - autorange frontend design
A good example to follow is also this one: Voltage Level Shifter and amplifier module for ACS712.
You will find there all the bits and pieces to design your own desired range high precision Voltage Level Shifter.
Happy breadboarding,
TJ
Available on Tindie: https://www.tindie.com/products/nEXT_EVO1/universal-ac-mains-dimmer-mpdmv41/
For example a 47K / 10K divider across the 3.3V to 0V and a 10K input from the sensor to the junction gives 0.09 -> 0.54V to feed into the ADC. This mean the swing from end to end is now only 0.45V rather than 1V.
This assumes the sensor has a low impedance compared to the 10K. Stability of the 3.3V rail is important.