Complex sentence: They have also published "tributes" to bands such as Emerson Lake & Palmer, Genesis, Jethro Tull, Pink Floyd, Rush and Yes; "Tribute to the Titans" is a collective tribute to progressive rock.
Split into simpler sentences: They have also released "tributes" to bands such as Emerson Lake & Palmer, Genesis, Jethro Tull, Pink Floyd, Rush and Yes. Their "Tribute to the Titans" is a collective tribute to progressive rock.