Complex sentence: There have been several factors influencing recent trends in Indian fertility including, but not limited to: limitation of family planning ability, age at marriage/childbirth, and the space between children born to one woman.
Split into simpler sentences: There have been several factors influencing recent trends in Indian fertility. These include, but are not limited to, limitation of family planning ability, age at marriage/childbirth, and the space between children born to one woman.