Complex sentence: Most manufacturers have their own trademarked names for these systems, such as Radica's "Play TV" or Majesco's "TV Arcade"; however, most retailers refer to all of them as TV games or Plug & Play games.
Split into simpler sentences: Most manufacturers have their own trademarked names for these systems, such as Radica's "Play TV" or Majesco's "TV Arcade". However, most retailers refer to all of them as TV games or Plug & Play games.