Complex sentence: There are alternatives to formaldehyde and phenol-based fluids, but these are technically not preservatives but rather sanitising agents and are not widely accepted, however the need to consider the hazards from using the chemical may reduce the use of formaldehyde.
Split into simpler sentences: There are alternatives to formaldehyde and phenol-based fluids, but these are technically not preservatives but rather sanitising agents and are not widely accepted. However, the need to consider the hazards from using the chemical may reduce the use of formaldehyde.