Complex sentence: Tribune initially had a 12.5% ownership interest in the network at its launch and later increased its stake to 22%; in addition, partly as a result of a November 1993 affiliation deal with the network, most of Tribune's television properties were WB affiliates.
Split into simpler sentences: Tribune initially had a 12.5% ownership interest in the network at its launch and later increased its stake to 22%. In addition, partly as a result of a November 1993 affiliation deal with the network, most of Tribune's television properties were WB affiliates.