Complex sentence: This paint scheme, also used by UK military training helicopters, can require them to be black on the sides and underneath, and yellow on top, however the Metropolitan Police use a dark blue color scheme with yellow underneath.
Split into simpler sentences: This paint scheme, also used by UK military training helicopters, can require them to be black on the sides and underneath, and yellow on top. However, the Metropolitan Police helicopters use a dark blue color scheme with yellow underneath.