Before revision:  Analysing the available literature, most of the existing event detection methods are only focused on statistical and syntactical features in data , even though the underlying semantics are also important for an effective information retrieval from text , because they describe the connections between words and their meanings.
After revision:  Analysing the available literature, most of the existing event detection methods are only focused on statistical and syntactical features in data , even though the underlying semantics are also important for an effective information retrieval from text since they represent the connections between words and their meanings.